| 摘要 |
PROBLEM TO BE SOLVED: To obtain a new compound having antimicrobial activity. SOLUTION: This compound is represented by the general formula (R1 and R2 are each an aryl group, a heterocyclic group, an alkyl group, an alkenyl group or the like which may be substituted; R3 is a hydrogen atom or a hydroxyl group; X1 and X2 are each an oxygen atom, a sulfur atom or a nitrogen atom which may be substituted), its pharmacologically acceptable ether, ester or N-alkyl derivative or their pharmacologically acceptable salts.
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