13270-65-0 5-phospho-alpha-D-ribose-1-diphosphate 5-phospho-ribosyl-pyrophosphate 5-phosphoribosyl-1-PP 5-phosphoribosyl-1-pyrophosphate 5-phosphoribosyl-PP 5-phosphoribosylpyrophosphate PRPP alpha-D-5-P-RibosylPP alpha-D-5-phosphoribosylPP phosphoribosylpyrophosphate