prov:value
| - wherein R, R1, R2, R3, and R4 each can be joined to a phenyl moiety to form a ring, each R???a, Rb, and R???c, independently of the others, is a halogen atom, an alkyl group, an alkoxy group, a nitrile group, a nitro group, an amide group, or a sulfonamide group, z1, z2, and z3 each, independently of the others, is an integer of 0, 1, 2, 3, or 4, n is an integer representing the number of carbon a
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