PROBLEM TO BE SOLVED: To provide a novel compound that has microtubule polymerization inhibitory activity and has a potential for an anticancer agent.SOLUTION: The present invention provides a compound represented by formula (I) or pharmaceutically acceptable salt thereof. (In the formula, A is a cycloalkyl group, an aryl group or a heterocyclyl group R1 is an alkyl group, an alkenyl group, an alkynyl group or an arylalkyl group m is an integer of 1-8).SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT