prov:value
| - and R is hydrogen; lower alkyl, especially methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, 2,2-dimethyl-propyl or 2-ethyl-n-butyl; mono- or di-hydroxy-lower alkyl, especially 2,3-dihydroxy-propyl or 3-hydroxy-2,2-dimethylpropyl; C.sub.6-C.sub.14-aryl which is unsubstituted or substituted by one to three substituents selected from lower alkyl, especially methyl or ethyl, halo-lower alkyl, es
|