1: 1-phenyl-1,2,3,4-tetrahydroisoquinoline oxalate With sodium hydroxide in water; ethyl acetate T=20°C; pH=14; 2: (2S,3S)-2,3-dihydroxybutanedioic acid in water; ethyl acetate T=20°C; 1.08333 h; Product distribution / selectivity;