prov:value
| - C6 -C18, R4 is --H, --CH3 or --Cl, R5 is --CH3 or --C2 H5, R6 is --H, --CH3, --C2 H5 or a phenyl group, R7 is --H, --CH3 or --C2 H5, R8 is an alkyl group or a substituted alkyl group of C6 -C18, each of R9 -R14 is independently --H, --CH3 or --C2 H5, each of R15 and R16 is independently --H, --CH3, --C2 H5 or a phenyl group, R17 is --H, --CH3, --C2 H5 , --OH, --NH2 or --NO2, R18 is an alkyl group
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