1H-Purine-2,6-dione, 3,7-dihydro-1,3-dimethyl-8-((4-methyl-1-piperidinyl)azo)- (9CI) 73908-80-2 8-(4-Methyl-1-piperidino-azo)theophylline NSC 62601 Theophylline, 8-(4-methylpiperidinoazo)-