FLUORAN COMPOUNDS

摘要

A fluoran compound represented by general formula: [I] where each of R1 and R2 is a C1-C4 alkyl group, a cycloalkyl group or an aryl group, or R1 and R2 may form together with N a saturated ring, R3 is a benzyl or phenyl group which may be substituted, and R4 is a C1-C4 alkyl group.