1,5-Naphthalenedisulfonic acid, 4-(2-mercapto-4,4,6-trimethyl-1(4H)-pyrimidinyl)- (9CI) 1-(4,8-Disulfo-1-naphthyl)-2-thio-4,4,6-trimethyl dihydropyrimidine 2(1H)-Pyrimidinethione, 3,4-dihydro-1-(4,8-disulfo-1-naphthyl)-4,4,6-trimethyl- 6281-68-1 NSC 5837 USAF K-2602