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long as it is a low molecular compound having a group capable of leaving by the action of an acid. 

In formula (F), Ra represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or an aralkyl group. Also, when n=2, two Ra’s may be the same or different, and two Ra’s may combine with each other to form a divalent heterocyclic hydrocarbon group (preferably having a carbon number of 20 or less) or a derivative thereof. 

Each Rb independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group or an alkoxyalkyl group, provided that when one or more Rb in -C(Rb )(Rb )(Rb) are a hydrogen atom, at least one ofremaining Rb is a cyclopropyl group, a 1-alkoxyalkyl group or an aryl group. 

At least two Rb’ s may combine to form an alicyclic hydro› carbon group, an aromatic hydrocarbon group, a heterocyclic hydrocarbon group or a derivative thereof. 

n represents an integer of Oto 2, m represents an integer of 1 to 3, and n+m=3. 

In formula (F), the alkyl group, cycloalkyl group, aryl group and aralkyl group represented by Ra and Rb may be substituted with a functional group such as hydroxyl group, cyano group, amino group, pyrrolidino group, piperidino group, morpholino group and oxo group, an alkoxy group or a halogen atom. The same applies to the alkoxyalkyl group represented by Rb. 

Examples of the alkyl group, cycloalkyl group, aryl group and aralkyl group (each of these alkyl group, cycloalkyl group, aryl group and aralkyl group may be substituted with the above-described functional group, an alkoxy group or a halogen atom) of Ra and/or Rb include: 

a group derived from a linear or branched alkane such as methane, ethane, propane, butane, pentane, hexane, heptane, octane, nonane, decane, undecane and dodecane, or a group where the group derived from an alkane is substituted with one or more kinds of or one or more groups of cycloalkyl group such as cyclobutyl group, cyclopentyl group and cyclo› hexyl group; 

a group derived from a cycloalkane such as cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, nor› bomane, adamantane and noradamantane, or a group where the group derived from a cycloalkane is substituted with one or more kinds of or one or more groups oflinear or branched alkyl group such as methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, 2-methylpropyl group, 1-methylpropyl group and tert-butyl group; 

a group derived from an aromatic compound such as ben› zene, naphthalene and anthracene, or a group where the group derived from an aromatic compound is substituted with one or more kinds of or one or more groups of linear or branched alkyl group such as methyl group, ethyl group, n-propyl 60 group, i-propyl group, n-butyl group, 2-methylpropyl group, 1-methylpropyl group and tert-butyl group; 

a group derived from a heterocyclic compound such as pyrrolidine, piperidine, morpholine, tetrahydrofuran, tet› rahydropyran, indole, indoline, quinoline, perhydroquino- line, indazole and benzimidazole, or a group where the group derived from a heterocyclic compound is substituted with one 

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5 or more kinds of or one or more groups oflinear or branched alkyl group or aromatic compound-derived group; a group where the group derived from a linear or branched alkane or the group derived from a cycloalkane is substituted with one or more kinds of or one or more groups of aromatic com› pound-derived group such as phenyl group, naphthyl group and anthracenyl group; and a group where the substituent above is substituted with a functional group such as hydroxyl group, cyano group, amino group, pyrrolidino group, piperi- lO dino group, morpholino group and oxo group. 

Examples of the divalent heterocyclic hydrocarbon group (preferably having a carbon number of 1 to 20) formed by combining Ra’s with each other or a derivative thereof include a group derived from a heterocyclic compound such as pyrrolidine, piperidine, morpholine, 1,4,5,6-tetrahydropy› rimidine, 1,2,3,4-tetrahydroquinoline, 1,2,3,6-tetrahydropy› ridine, homopiperazine, 4-azabenzimidazole, benzotriazole, 5-azabenzotriazole, lH-1,2,3-triazole, 1,4, 7-triazacy- clononane, tetrazole, 7-azaindole, indazole, benzimidazole, imidazo[l ,2-a ]pyridine, (1 S,4S)-( + )-2,5-diazabicyclo[2.2.1] heptane, 1,5, 7-triazabicyclo[ 4.4.0]dec-5-ene, indole, indo› line, 1,2,3,4-tetrahydroquinoxaline, perhydroquinoline and 1,5,9-triazacyclododecane, and a group where the group derived from a heterocyclic compound is substituted with one or more kinds of or one or more groups oflinear or branched alkane-derived group, cycloalkane-derived group, aromatic compound-derived group, heterocyclic compound-derived group, and functional group such as hydroxyl group, cyano group, amino group, pyrrolidino group, piperidino group, morpholino group and oxo group. 

Specific examples of the compound (D) particularly pre› ferred in the present invention are illustrated below, but the present invention is not limited thereto. 

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