prov:value
| - wherein R29 is chosen from a hydrogen atom, CH3O, CH3CH2O and phenyl, R30 is chosen from hydrogen and lower alkyl radicals, such as methyl or ethyl, R31 is chosen from hydrogen and lower alkyl radicals, such as methyl or ethyl, R32 is chosen from a lower alkyl radicals, such as methyl or ethyl, and radicals corresponding to the formula: ???R33???N(R31)2, wherein R33 and R31 are as defined herein,
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