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A Thermo Fisher Scientific (Waltham, MA) Biobasic AX anion exchange column (5 micron, 50 × 2.1 mm) was used for chromatography with the following conditions: Buffer A: 8:2 dH 2 O:MeCN + 10 mM NH 4 OAc pH 6, Buffer B: 7:3 dH 2 O:MeCN + 1 mM NH 4 OAc pH 10.5 with gradient conditions 0−1.0 min 100% A, 1.0−2.5 min gradient to 35% B, 2.5−5.0 min 35% B, 5.0−7.0 min gradient to 65% B, 7.0−8.0 min 65% B, 8.0−8.5 min gradient to 100% B, 8.5−9.5 min 100% B, 9.5−10 min gradient to 100% A, 10 − 11 min 100% A
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