| abstract |
A compound represented by the following formula (I′) n n n n n n n n n n wherein X 1 is a methylene group, an ethylene group, a trimethylene group or a vinylene group, X 2 is a divalent group represented by the following formula A or B, n n n n n n n n n n Y is an ethylene group or a vinylene group, m and n are each an integer of 0 to 7, which satisfy m+n=0 to 8, R1 and R2 are each independently a hydrogen atom, a methyl group or an ethyl group, provided that when X 1 is a methylene group, then X 2 is not a divalent group represented by the formula A, and when X 1 is a vinylene group, then X 2 is not a divalent group represented by the formula A. The compound is a stable capsinoid derivative, and is useful as an active ingredient of an external blood circulation enhancer or a cosmetic composition, a pharmaceutical composition, or a food composition. |