reagent derivatized residue triphenylmethyl 242.1095428466796875 242.32000732421875 C 19 H 14 From DeltaMass: Average Mass: 242 Average Mass Change: 242.3 Notes: blocking group used in peptide synthesis for C,H,Q,N MOD:01114 PSI-MOD Trityl Trt artifact modification from DeltaMass