prov:value
| - R3 is a radical selected from the group consisting of hydrogen, methyl, ???CHO, ???COOH, ???CO2Me, ???CO2 (tert-butyl), ???CO2 (iso-propyl), ???CO2 (phenyl), ???CO2 (benzyl), ???CONH(furfuryl), ???CO2 (N-benzo-(2R, 3S)-3-phenylisoserine), ???CONH(methyl)2, ???CONH(ethyl)2, ???CONH(benzyl), and ???CH2R5.
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