| http://www.w3.org/ns/prov#value | - R1 is methyl; R2 is methyl or ethyl; R3 and R4 are each independently a hydrogen atom, halo, cyano, methyl, nitro, ???NR6R7, ???CR8???NOR9 or ???NHCOOR10, provided that both R3 and R4 are not a hydrogen atom; R6, R7, R8, R9, R10 and R13 are each independently a hydrogen atom or (C1-C4)alkyl; X is chloro and Y is a hydrogen atom; or the optical enantiomers thereof. 14.
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