prov:value
| - Preferred compounds include compounds of formula II, wherein R1 is a straight or branched, preferably straight, (C13-20)carbon chain optionally substituted by nitro, halogen, amino, hydroxy or carboxy, and, more preferably compounds of formula II, wherein R1 is phenylalkyl, optionally substituted by halogen, e.g. wherein alkyl is (C1-6)alkyl, optionally substituted by hydroxy, and wherein phenyl i
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