2-isopentenyl diphosphate 358-71-4 358-72-5 CPD-4211 DMAPP DMPP DPP delta-prenyl diphosphate delta2-isopentenyl-diphosphate di-CH3-allyl-PPi dimethylallyl-PP dimethylallyl-PPi dimethylallyl-diphosphate dimethylallyl-pyrophosphate prenyl diphosphate prenyl-diphosphate