| http://www.w3.org/ns/prov#value | - , alkyl of one to twelve carbon atoms, lower fluoroalkyl, cycloalkyl, phenyl or benzyl; R2 is hydrogen, alkyl of one to twelve carbon atoms, lower fluoroalkyl, cycloalkyl, phenyl or benzyl R7 is lower alkyl or hydrogen, provided that R7 is not hydrogen when A is H, B is a bond and x is 0; and R8 is hydrogen, lower alkyl or lower fluoroalkyl. 2.
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