prov:value
| - 0, ???CONR11R12 or ???COOR13; R6, R7, R8, R9, R10, R11, R12, and R13 are a hydrogen atom or (C1-C4)alkyl; and X and Y are each independently a hydrogen atom, halo, cyano, thiocyano or isothiocyano, provided that both X and Y are not a hydrogen atom; or the optical enantiomers thereof. 12.
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