| http://www.w3.org/ns/prov#value | - n is 0 or 1; Z is an O or S; and R1, R2, and R3 are independently selected from the group consisting of H, an optionally substituted alkyl or alkenyl group, and an optionally substituted phenylmethyl group, with the exceptions that: R1 and R2 cannot both be H; when one of R1 or R2 is H or a methyl group, the other of R1 or R2 cannot be a methyl or ethyl group; and when n=1, R1 and R2 cannot both b
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