abstract |
(57) [Abstract] [PROBLEMS] To improve fog and color tone. A compound of formula is included. R 1 —S—SO 2 —R 2 (In the formula, R 1 and R 2 represent an aliphatic hydrocarbon group, an aryl group or a heterocyclic group, and at least one of R 1 and R 2 represents a heterocyclic group. .) |