| http://www.w3.org/ns/prov#value | - In formulae (I) and (II), R5, R6 and R7 are hydrogen and iso-C3 -C5 -alkyl such as isopropyl, tert.-butyl, 1-methylpropyl, 1,1-dimethylpropyl, 1-methylbutyl, 1,2-dimethylpropyl and 2,2-dimethylpropyl, preferably isopropyl, tert.-butyl, 1-methylpropyl and 1,1-dimethylpropyl; more preferably tert.-butyl and 1,1-dimethylpropyl and, most preferably, tert.-butyl.
|
