Benzopyran derivatives and their use.

摘要

This invention relates to a compound represented by the formula: <CHEM> wherein B represents a hydrogen atom or a lower alkyl group; ring A represents a benzene ring which may have one or more substituents; <IMAGE> represents a single or double bond; Q1 represents the group represented by the formula, <CHEM> , or a hydrocarbon residue substituted with the group represented by the formula, <CHEM> wherein X represents a bond or a spacer having a chain length of 1 to 4 atoms as the linear moiety which may have one or more side chains; R<1> and R<2>, whether identical or not, independently represent a hydrogen atom or a lower alkyl, or may bind together to form a ring; Q2 represents a hydrogen atom, a hydrocarbon residue which may be substituted or a heterocyclic ring residue which may be substituted; or a salt thereof.