Table 1. Characterization of (R)-, (S)- and (RS)-MPD.

	Chemical purity (%)	Enantiomeric ratio	D 20 (c 1.0, H2O)
(R)-MPD	99.5	99.9:0.1	18.8 0.2
(S)-MPD	99.7	99.9:0.1	19.0 0.2
(RS)-MPD	99.9	50:50†	0.0 0.2

^†Theoretical value (not measured).