prov:value
| - s methyl, ethyl, propyl and butyl, aryl group having 6-10 carbon atoms or unsaturated alkyl group having 2-10 carbon atoms; each of R2, R3, R4, R5, R6, R7, R8, R9, R10 or R11 is a hydrogen atom, an unsubstituted or substituted alkyl group having 1-10 carbon atoms, aryl group having 6-10 carbon atoms or unsaturated alkyl group having 2-10 carbon atoms).
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