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What does -EC stand for?

-EC stands for RS)-(-)-ephedrine hydrochloride

This definition appears rarely

Samples in periodicals archive:

The present work concerns with the development of stability indicating the RP-HPLC method for simultaneous determination of guaifenesin (GUF) and pseudoephedrine hydrochloride (PSH) in the presence of guaifenesin related substance (Guaiacol). GUC, and in the presence of syrup excepients with minimum sample pre-treatment. In the developed RP-HPLC method efficient chromatographic separation was achieved for GUF, PSH, GUC and syrup excepients using ODS column as a stationary phase and methanol: water (50:50, v/v, pH = 4 with orthophosphoric acid) as a mobile phase with a flow rate of 1 mL min−1 and UV detection at 210 nm.