| http://www.w3.org/ns/prov#value | - erably, methyl; in the R2 substituent the C1 -C6 alkyl group is, preferably, C1 -C4 alkyl, in particular ethyl or n-propyl, and the terminal basic moiety, may be one of those previously specified, e.g., a group ##STR27## or a group ##STR28## wherein p is an integer of 1 to 4.
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