135521-80-1 5H-(1)Benzothiopyrano(4,3-b)pyridine-3-carbonitrile, 9-chloro-2-methoxy-4-(1-naphthalenyl)- 9-Chloro-2-methoxy-4-(1-naphthalenyl)-5H-(1)benzothiopyrano(4,3-b)pyridine-3-carbonitrile BRN 4275368