(Z)-2,3-Dihydro-6-chloro-3-(2-naphthalenylmethylene)-4H-1-benzothiopyran-4-one 130689-11-1 4H-1-Benzothiopyran-4-one, 2,3-dihydro-6-chloro-3-(2-naphthalenylmethylene)-, (Z)- BRN 3621304