leucine valine asparagine threonine and aminobenzoic acid in a similar manner a rhodanine compound having a sulfonic acid group in an n substituent can be synthesized examples of the starting materials include taurine and aminobenzenesulfonic acid examples of reagents which convert a carboxylic acid or sulfonic acid group to the corresponding acid chloride and reagents which activate amidation or esterification include thionyl chloride oxalyl chloride dicyclohexyl carbodiimide carbonylimidazole 2 chloro 1 methylpyridinium iodide trimethylacetyl chloride disuccinimide carbonate and phosphoric acid based condensing agents regarding the compounds containing a primary or secondary amino group serving as amidation sources a wide variety of compounds can be employed examples which could be very limited include aniline sulfanilic acid aminobenzoic acid allylamine amino acids n phenylaminobutylaldehyde dimethyl acetal n benzylaminobutylaldehyde dimethyl acetal aminobutylaldehyde dimethyl acetal n methylaminoacetoaldehyde dimethyl acetal aminoaldehyde dimethylacetal ethylenediamine diaminopropane diaminobutane diaminohexane diaminoheptane phenylenediamine polyvinylamine diaminosiloxane and jeffamine polyether amine d 400 ed 600 ed 900 and edr 148 among the photosensitive compounds of the present invention compounds represented by the aforementioned formulas iii to vi are particularly useful as bichromate free photosensitive material and low pollution and high photosensitivity polymer in that these compounds permit introduction of a photosensitive group to a poly vinyl alcohol skeleton through acetalization of these compounds containing an acetal moiety and a primary or secondary amino group are preferred as amidation sources typical examples include the following compounds the photosensitive compounds of the present invention represented by the aforementioned formulas iii to vi are reacted in the presence of an acid catalyst with a.