prov:value
| - R12, R13, R14, R15, and R16 may be the same or different and each is a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, a vinyl group, an isopropyl group, a trifluoromethyl group, a t-butyl group, an n-pentyl group, an n-octyl group, a methoxy group, an amino group, a cyano group, a nitro group, a hydroxyl group, a thiol group, a meth
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