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1H-NMR spectrum of the toxin isolated from the ribbon worm Cephalothrix simula from Hiroshima Bay by means of irradiation at C4-H. Five milligrams of HMT was dissolved in 0.5 mL of 1% CD3COOD in D2O and measured for 1H-NMR spectrum measured on a JEOL JNM-500 NMR spectrometer, using acetone as the internal standard.
