| abstract |
A fluorescent staining agent suitable for biologically safe endoscopic observation is provided. The following equation (1) [Wherein, R 1 represents a hydrogen atom or a hydroxy group, R 3 represents a phenyl group or a methyl group to which R 2c is bonded, and 1 to 3 of R 2a , R 2b and R 2c are —SO 3 M (Wherein M represents an alkali metal atom or an alkaline earth metal atom) or —SO 3 NH 4 , one represents —SO 3 — , and the remainder represents a hydrogen atom]. A tissue fluorescent staining composition for an endoscope. [Selection figure] None |