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Lamotrigine EP Impurity B Catalogue No. - VL980007 CAS No. - 94213-24-8 Molecular Formula - C9H7CI2N5 Molecular Weight - 256.09 IUPAC Name - (2E)-[2-(Diaminomethylidene)diazanylidene](2,3-dichlorophenyl)acetonitrile Synonyms - E-Isomer of Iminoguanidine For Lamotrigine