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Deuterated chloroform (CDCl3), is an isotopologue of chloroform (CHCl3) in which the hydrogen atom ("H") is replaced with a deuterium (heavy hydrogen) isotope ("D").
C 2111 Chloroform-D 99.8 atom % D [contains 1 % (v/v) TMS] - used in NMR spectroscopy of organic molecules.