CHROMAN DERIVATIVES

摘要

The present invention relates to chroman derivatives of the formula (I): [wherin R1 represents a hydrogen atom, a halogen atom, a C1-6 alkyl group, a C1-6 alkoxy group, a C3-6 alkoxymethyl group, etc., R3 and R4 each independently represent a hydrogen atom, a C1-6 alkyl group, etc., R5 represents a hydroxyl group or a C1-6 alkylcarbonyloxyl group or forms a bond together with R5, R6 represents a hydrogen atom or forms a bond together with R5, R7 and R8 each independently represent a hydrogen atom, a C1-6 alkyl group, a C3-6 cycloalkyl group, a phenyl group, etc. n is 0 or an integer of 1, 2, 3 or 4, W represents a phenyl group, etc., X represents C=O, CH2, SO2, etc., Y represents NR17 (in which R17 represents a hydrogen atom, a C1-4 alkyl group, a phenyl group, etc.), etc., Z does not exist or represents CH2 or NR18 (R18 represents a hydrogen atom, a C1-4 alkyl group, or a phenyl group, etc.)] or their salts.