| http://www.w3.org/ns/prov#value | - There come into consideration as C1???C4alkyl for R1, R2, R3, R4, R5 and R6, each independently of the others, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl or isobutyl, preferably methyl or ethyl and especially methyl.
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