prov:value
| - R1 is a halogen atom, preferably a chlorine atom, a cyano group, a hydrogen atom, a hydroxyl group, a C1 - to C18 -alkoxy group, preferably a C1 - to C8 -alkoxy group, a C1 - to C18 -alkyl group, preferably a C1 - to C8 -alkyl group, or a cholesteryl radical, and/or
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