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c+ represents a counter cation. 

The counter cation is preferably an onium cation. More particularly, as preferred examples thereof, there can be men› tioned a sulfonium cation described above as being expressed by s+ (R$_{201}$’)(R$_{202}$’)(R$_{203}$’) of general formula (ZI) and an 

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iodonium cation described above as being expressed by 1+ (R$_{204}$’)(R$_{205}$’) of general formula (ZII) in connection with photoacid generators. 

Non-limiting specific examples of the compounds (PA) are given below. 

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