prov:value
| - wherein each R???a, R???b, 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, and x are as defined hereinabove, D is an anion corresponding to the mineral acid used in the reaction to synthesize the
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