methylated glycine alpha-amino trimethylated protonated-residue N,N,N-trimethylglycine 101.0840606689453125 101.15000152587890625 43.054775238037109375 43.090000152587890625 C 5 H 11 N 1 O 1 N-term glycine betaine natural carboxymethyl-trimethylazanium N,N,N-trimethylglycinium C 3 H 7 (trimethylammonio)ethanoic acid 1+ 1-carboxy-N,N,N-trimethylmethanazanium G PSI-MOD betaine modification from RESID MOD:01982 N2Me3+Gly N,N,N-trimethylglycine cation MOD_RES N,N,N-trimethylglycine carboxy-N,N,N-trimethylmethanaminium 2-trimethylammonioacetate