| http://www.w3.org/ns/prov#value | - r by trifluoromethyl; or a salt thereof, and general formula (B): wherein each R1 is independently of one another hydrogen; Ci-7 alkyl, C3-8 cycloalkyl or benzyl, in particular both Rl are branched C3-6 alkyl such as isopropyl; and, Act is an activating group selected from an amino protecting group; or a salt thereof. 6.
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