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

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Intens.<br />

5000<br />

276.8<br />

4000<br />

3000<br />

2000<br />

1000<br />

0<br />

554.0<br />

162.7<br />

188.7 248.8<br />

407.0<br />

261.9 304.7<br />

442.9 474.1 536.1<br />

150 200 250 300 350 400 450 500 550 m/z<br />

Figure 43. Tandem APCI-MS 2 spectrum for macrocycle (17), DMSO (positive mode).<br />

Scheme 8. Proposed fragmentation mechanism for macrocycle (17).<br />

Intens.<br />

5000<br />

4000<br />

3000<br />

2000<br />

1000<br />

0<br />

532.9<br />

256.6 274.7<br />

246.7<br />

292.7<br />

332.8 404.8<br />

360.9<br />

216.6<br />

376.9<br />

505.6 522.9 552.0<br />

150 200 250 300 350 400 450 500 550 m/z<br />

Figure 44. Tandem APCI-MS 2 spectrum for macrocycle (17), DMSO (negative mode).<br />

S25

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