NMR titration studies in acetonitrile-d(3)/DMSO-d(6) mixtures demonstrate that diindolylurea-based receptors can form complexes with the organophosphorus nerve agent soman in organic solution.
A major insecticidal constituent of Ryania speciosa is isolated and characterized by n.m.r. and mass spectroscopy as the new alkaloid 9,21-didehydroryanodine (2); reduction of (2) with hydrogen (or tritium) gas yields both ryanodine (1) and 9-epiryanodine (3) (or their 9,21-3H analogues) in a 1 : 9 ratio.
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