118045-71-9 Cpc TP Cpec-TP Cyclopentenyl cytosine 5'-triphosphate Cyclopentenylcytosine 6-triphosphate Triphosphoric acid, P-((3-(4-amino-2-oxo-1(2H)-pyrimidinyl)-4,5-dihydroxy-1-cyclopenten-1-yl)methyl) ester, (3R-(3alpha,4beta,5beta))-