S-(+)-Mandelic acid£¬17199-29-0 R-(-)-Mandelic acid£¬611-71-2 D-DTTA(H2O)/71607-31-3 L-DTTA(H2O)£¬ D-DTTA/32634-68-7 L-DTTA /32634-66-5 D-DBTA(H20) /80822-15-7 L-DBTA (H2O)/62708-56-9 D-DBTA/17026-42-5 L-DBTA/2743-38-6