Fig. 3From: Multiple analytical methods for determination of formoterol and glycopyrronium simultaneously in their novel combined metered dose inhalerFirst derivative of the ratio spectra of FF (0.48, 0.96, 1.2, 2.4, 4.8, 7.2 and 9.6 µg/mL) when 1.8 µg/mL GLY was used as divisor (at 214, 229 nm)Back to article page