prov:value
| - ne another are hydrogen, halogen, cyclopentyl, cyclohexyl, C2 -C12 alkenyl, or are phenyl-substituted C1 -C4 alkyl, or are phenyl which is unsubstituted or mono- or di-substituted by C1 -C4 alkyl and/or C1 -C4 alkoxy, and with the proviso that at least one of the radicals R3, R4, R5, R6 and R7 is other than hydrogen, and that, if R1 and R2 are methyl, R5 is not methyl. 2.
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