PROBLEM TO BE SOLVED: To provide a medicine containing a compound that has a novel antitumor effect.SOLUTION: A medicine contains compound showed by the following general formula (1), wherein Rrepresents a lower alkyl group optionally substituted by a halogen atom, an aryl group, an aryloxy group or one or more halogen atoms, Rrepresents a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group, and m represents an integer from 1 to 3, provided that m represents 2 or 3 Ris the same or different.
