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(a) Δδ (=δR − δS) values for (R)- and (S)- MPA esters of 2 and 3. (b) UPLC analysis profile of (R)- and (S)- MPA esters of 2 and 3 over a 20 min gradient as follows: T = 0.0, 5% B; T = 15.0, 95% B; T = 17.0, 100% B, T = 18.0, 100% B, and T = 18.1, 5% B, and T = 20.0, 5% B (A, MQ+0.2% HCOOH; B, MeOH+0.2% HCOOH).
