prov:value
| - where R??? has the meanings of R2 or R3 but is other than hydrogen, and Y is a suitable leaving group such as bromine, chlorine, mesyl, tosyl, hydroxy, or formyl (CHO), thus obtaining a compound of formula (I) wherein both or at least one of R2 and R3 is other than hydrogen; and, optionally, converting a compound of formula (I) or (II) into another compound of formula (I) or (II), and/or into a sa
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