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The genus Hornschuchia obliqua belonging to the Annonaceae family. The family comprising ca 130 genera and 2300 species, located in the Magnoliales, a primitive order of plants, is known to produce isoquinoline alkaloids derivatives 1 . Indeed the great majority of alkaloidal constituents of these plants are isoquinoline-derived structures, along with a wide range of non-alkaloidal compounds of varied stuctural types 2,3 . The present paper describes the chemical investigation of the alkaloidsdoi:10.1590/s0102-695x2002000300057 fatcat:vidkcenlx5fs7ldqn43yiv7rsy