| abstract |
Disclosed is a compound represented by the general formula (I'): (I') wherein X1 represents a methylene group, an ethylene group, a trimethylene group or a vinylene group; X2 represents a bivalent group represented by the general formula A or B: A: B: Y represents an ethylene group or a vinylene group; m and n independently represent an integer ranging from 0 to 7 which satisfies the requirement: m+n = 0 to 8; and R1 and R2 independently represent a hydrogen atom, a methyl group or an ethyl group, provided that X2 is not a bivalent group represented by the formula A when X1 represents a methylene group, and X2 is not a bivalent group represented by the formula A when X1 represents a vinylene group. The compound is a stable capsinoid derivative and is useful as an active ingredient for a blood flow enhancer for external application, a cosmetic composition, a pharmaceutical composition or a food composition. |