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(A) LC chromatogram of PGDE. The elution program was as follows: 0 min, 50% A; 1.0 min 50% A; 3.0 min 85% A; 5.0 min 90% A; 7.0 min 100% A; 9.0 min 100% A; 9.10 min 50% A; 11.0 min 50% A (mobile phase consisting of 50% methanol (A) and water adjusted to pH 2.8 with formic acid (FA; B). Flow rate: 0.3 mL/min; injection volume: 3 μL. Peaks: desoxyviperidone (3); viperidone (4). (B) Typical total ion chromatogram in positive-ion APCI-MS mode for compounds 3 and 4.
