| http://www.w3.org/ns/prov#value | - W represents an OH group, SH group, NH group, NH2 group, COOH group or CONHNH2 group, R1 and R2 represent independently a C1 to C20 alkyl group, a C2 to C20 alkenyl group, an aralkyl group such as benzyl group, or one of the above groups wherein some carbon atom(s) in the carbon chain are replaced by other atom(s) (e.g., oxygen) or some hydrogen atom(s) on the carbon chain are replaced by a haloge
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