prov:value
| - For example one of R1, R2 or R4 comprises an amino acid, the remaining of R1, R2 or R4 independently comprise ???OH, ???O, an ester, a carbonate or a carbamate, while R3 is a halogen, hydroxyl or an ester and R5 and R6 independently are ???H, ???(CH2)n???CH3, ???(CH2)n???CH2OH, or ???(CH2)n???CH2F, ???(CH2)2-4???(CH2)2-4???CH3, where n is 0, 1, 2, 3, 4, 5, 6, 7 or 8 often 0, 1, or 2, usually 0.
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