Patent ID: 8853441

Claim:
A sulfonium compound having two acid sites, each respectively having an acid generator that is different from the other, and represented by the following formula (1): wherein in the formula (1), X represents an electron donor group; R 1 and R 2 each independently represent any one selected from the group consisting of an alkyl group, a cycloalkyl group, an aryl group, a heteroalkyl group, a heterocycloalkyl group and a heteroaryl group, or R 1 and R 2 may be joined, together with the sulfur atom to which R 1 is bonded, to form a heterocycloalkyl group having 2 to 7 carbon atoms; R 4 to R 6 each independently represent any one selected from the group consisting of an alkyl group, a cycloalkyl group, an aryl group, a heteroalkyl group, a heterocycloalkyl group, and a heteroaryl group, or R 4 and R 5 may be joined, together with the sulfur atom to which R 4 is bonded, to form a heterocycloalkyl group having 2 to 7 carbon atoms; R 3 represents any one selected from the group consisting of a cyclic alkenediyl group, a heterocyclic alkenediyl group, an arylene group and a heteroarylene group; and A represents an anion.