prov:value
| - Preferably, R3 is a substituted methyl of the general formula (???CRaRbRc) wherein Ra is OH, OR, CH2OR, SR, and NR2, where each R is independently H, optionally halogenated (preferably fluorinated or chlorinated) C1-C4 alkyl, or optionally halogenated C1-C4 acyl, and preferably OH; and each of Rb and Rc is independently H, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C8 cycloalkyl, C3-C8 cycloalk
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