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The Development of Novel Antibiotics Using ... - Jacobs University

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Scheme 13. Proposed fragmentation mechanism for macrocycle (15), positve mode.<br />

Intens.<br />

6<br />

x10<br />

3<br />

2<br />

1<br />

646.2 771.4<br />

911.5<br />

1107.6<br />

0<br />

500 1000 1500 2000 2500 m/z<br />

Figure 59. APCI-MS spectrum for macrocycle (16) from DMSO (positive mode).<br />

Intens.<br />

5<br />

x10<br />

2.0<br />

1.5<br />

738.3<br />

753.3<br />

796.4<br />

881.5<br />

912.5<br />

1.0<br />

0.5<br />

0.0<br />

271.9<br />

286.0<br />

341.1<br />

398.1<br />

368.0<br />

456.1 497.1<br />

300 400 500 600 700 800 m/z<br />

Figure 60. Tandem APCI-MS 2 spectrum for macrocycle (16) from DMSO (positive mode).<br />

S34<br />

624.2<br />

723.3<br />

821.4<br />

863.4

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