The Crystal and Molecular Structure of Two Drug Compounds: Tazettine and Corydaldine

The title compounds Tazettine (C 18 H 21 NO 5 ) and Corydaldine (3,4‐dihydro‐6,7‐dimethoxy‐1(2H)‐isoquinolinone, C 11 H 13 NO 3 ) have been isolated from the bulbs of Pancratium maritimum L. (Amaryllidaceae) and Corydalis solida subspecies brachyloba , respectively. The X‐ray structures were solvcd for Tazettine (I) and Corydaldine (II) (λ MoK α , R = 0.0499 and 0.0418, respectively). Crystals of (I) are orthorhombic, a = 7.115(1), b =13.377(1), c = 16.878(1) Å, Z = 4, D cale = 1.370 g. cm −3 , space group P2 1 2 1 2 1 . Crystals of (II) are monoclinic, a =10.641(1), b = 6.636(1), c = 14.938(1) Å, β = 90.31(1)°, Z = 4, D calc = 1.305 g. cm −3 , space group P2 1 /a.