| http://www.w3.org/ns/prov#value | - 2, g3, g4, g5 and g6 are all hydrogen; a group R2 as defined above when X is --(CH2)x N(R3)--; or a group R5 when X is a direct bond, R5 being a (C1 -C3)-alkyl; a (C3 -C12)-cycloalkyl which is unsubstituted or substituted by a (C1 -C5)-alkyl; a phenyl-(C1 -C3)-alkyl which is unsubstituted or substituted by a halogen or by a (C1 -C5)-alkyl; a cycloalkyl-(C1 -C3)-alkyl in which the cycloalkyl is C3
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