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

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Intens.<br />

4<br />

x10<br />

550.9<br />

3<br />

2<br />

1<br />

0<br />

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

Figure 64. APCI-MS 2 spectrum for macrocycle (18) from DMSO (negative mode).<br />

Intens.<br />

6000<br />

274.7<br />

5000<br />

256.7<br />

4000<br />

3000<br />

2000<br />

246.7<br />

292.8<br />

404.9<br />

532.9<br />

551.0<br />

1000<br />

332.8 360.9 386.9<br />

230.6<br />

523.0<br />

0<br />

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

Figure 65. Tandem APCI-MS 2 spectrum for macrocycle (18) from DMSO (negative mode).<br />

HO OH<br />

H<br />

HN<br />

NH<br />

N O O N<br />

HN<br />

N<br />

H<br />

O OH<br />

NH<br />

O O N<br />

H<br />

HN<br />

N<br />

O OH<br />

NH<br />

O O N<br />

H<br />

HN<br />

N<br />

O OH<br />

NH<br />

O O N<br />

- H<br />

-H 2 O<br />

N<br />

HN<br />

O<br />

HO<br />

O N<br />

NH<br />

OH<br />

N<br />

HN<br />

O<br />

HO<br />

O N<br />

NH<br />

OH<br />

N<br />

HN<br />

O<br />

HO<br />

O N<br />

NH<br />

OH<br />

H<br />

N<br />

HN<br />

O<br />

O N<br />

NH<br />

OH<br />

C 24 H 24 N 8 O 8<br />

m/ z 552<br />

C 23 H 24 N 8 O 8<br />

m/ z 551<br />

C 24 H 21 N 8 O 6<br />

m/ z 533<br />

H<br />

O<br />

OH<br />

HN<br />

N<br />

NH<br />

O O N<br />

N<br />

N<br />

C 20 H 17 N 6 O 4<br />

m/ z 405<br />

Scheme 16. Proposed fragmentation mechanism for macrocycle (18), negative mode.<br />

S37

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