prov:value
| - as acetyl, propionyl, butyryl or pivaloyl, R.sub.4 is phenyl which is unsubstituted or mono- or disubstituted by C.sub.1 -C.sub.4 alkyl, such as methyl, C.sub.1 -C.sub.4 alkoxy, such as methyl, halogen of atomic number upto and including 35, such as chlorine, and/or trifluoromethyl, or unsubstituted naphthyl, pyridyl, benzofuranyl, indolyl, benzimidazolyl or quinolyl, X.sub.1 is methylene, hydroxy
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