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Recebido em 14/7/11; aceito em 25/11/11; publicado na web em 20/1/12 DEREPLICATION OF APORPHINE AND OXOAPORPHINE ALKALOIDS FROM Unonopsis guatterioides BY ESI-IT-MS. The dereplication of aporphine and oxoaporphine alkaloids by direct infusion in ESI-IT-MS n system was applied for alkaloidal fractions of the Unonopsis guatterioides (Annonaceae). Its main advantage over other dereplication methods is the ability to quickly identify substances in complex mixtures without the use of coupleddoi:10.1590/s0100-40422012000500015 fatcat:z5bs55d4wjdvljd7uyjg7leyhu