Patent ID: 6846934

Claim:
A photochromic diarylethene compound having isoxazole group expressed in the following formula (1), wherein R 1 is a direct bond; R 2 is a hydrogen atom, (CR 4 H) n OH or C 6 (R5) m H 1 ; R 3 is selected from the group consisting of a hydrogen atom, phenylisoxazole, hydroxymethylisoxazole, acetyl, hydroxy, and phenyl; R 4 is hydrogen or C 1 -C 10 alkyl; R 5 is chloro, nitro, bromo, or the same as R 4 ; X and Y are S; Z is methylene optionally substituted with fluoro or carbonyl; and n, m and l are an integer of 1 to 5.