20979-23-1 CARBONIC ACID, THIO-, ANHYDROSULFIDE with DITHIO-1-NAPHTHALENECARBAMIC ACID, ETH Carbonic acid, thio-, anhydrosulfide with dithio-1-naphthalenecarbamic acid, ethyl ester Thiocarbonic acid anhydrosulfide with dithio-1-naphthalenecarbamic acid ethyl ester