| prov:value
| - eral formula: wherein R represents a lower alkyl group, when Y is a hydrogen atom, X is a radical selected from the group consisting of a lower alkyl group, a lower alkoxy group and a benzyloxy group, when X is a hydrogen atom, Y is a radical selected from the group consisting of a chlorine atom, a lower alkyl group, a lower alkoxy group, a benzyloxy group, an acetoamino group, a N-acetyl-N-lower
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