6H-Purin-6-one, 2-amino-1,9-dihydro-9-(5-O-(hydroxy((hydroxy(phosphonooxy)phosphinyl)oxy)phosphinyl)-beta-D-arabinofuranosyl)- 72490-81-4 9beta-D-Arabinofuranosylguanosine 5'-triphosphate Ara-GTP