prov:value
| - According to the present invention, there is provided a sulfonium complex or oxosulfonium complex of the formula (1), ##STR2## wherein R1 is a benzyl group, a substituted benzyl group, a phenacyl group, a substituted phenacyl group, an aryloxy group, a substituted aryloxy group, an alkenyl group or a substituted alkenyl group, each of R2 and R3 is independently any one of groups defined as R1, an
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