1-n-Butyl-2-phenyl-3-N-piperidinomethyl-8-methylimidazo(1,2-f)xanthine hydrobromide 1H-Imidazo(2,1-f)purine-2,4(3H,8H)-dione, 8-butyl-1-methyl-7-phenyl-6-(piperidinomethyl)-, monohydrobromide 85592-20-7