prov:value
| - B1 is O, NH, N-alkyl, N-aryl in particular n-phenyl, S, CH2, CH-alkyl or CH-aryl in particular CH-phenyl;B2 is N, CH, C-alkyl or C-aryl in particular C-phenyl;the radicals R???, R??? and R??????, which may be identical or different, represent hydrogen, a C1-C6 alkyl, whether substituted or non-substituted, a cyano radical, a halogen or a C6-C10 aryl, whether substituted or non-substituted, in part
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