For other salt forms or analogues please inquire. Synonym: P1- (5'- Guanosyl)- P4- (5'- adenosyl)- tetraphosphate. Ap4G is a dinucleoside polyphosphate containing two different purine nucleobase moieties and shows vasoactivity. Detailed technical information and references available. References: Schlüter et al., J. Clin. Invest., 101, 682 - 688 (1998); Lewis et al., Br. J. Pharmacol., 129, 124 - 130 (2000); Van der Giet et al., Br. J. Pharmacol., 132, 467 - 474 (2001); Ralevic et al., Br. J. Pharmacol., 134, 1073 - 1083 (2001).