CC[C@H]([NH3+])C(=O)N[C@H]4[C@@H](C[NH3+])CC[C@H]3CC[C@@H](C(=O)NC(c1ccccc1)c2ccccc2)N3C4=O X23_600_3CM2 0.735 133.789 36 493.652 8 8 1 8 470.821