| 摘要 |
PROBLEM TO BE SOLVED: To provide a stable monohydrate of an aminobenzenesulfonic acid derivative. SOLUTION: This monohydrate of the aminobenzenesulfonic acid is the monohydrate of a compound represented by general formula (I) (wherein, R1 is a hydrogen atom, a 1-6C alkyl group, a 3-7C cycloalkyl group, a 1-4C halogenated alkyl group, a halogen atom or a 6-12C aryl group; R2 is a 1-6C alkyl group or a 7-12C aralkyl group which may have one or more substituents selected from a group consisting of a cyano group, a nitro group, a 1-6C alkoxy group, a halogen atom, a 1-6C alkyl group and an amino group; and n is an integer of 1-4). |
