TABLE 1.

Enrichment of carbon unit in purified N-glutarylmonascorubramine after cultivation of M. ruber in the presence of [1-¹³C]-, [2-¹³C]-, and [1,2-¹³C]acetate

Carbon	Chemical shift (ppm)	Relative enrichmenta
1	14.39	13.3
2	23.60	5.6
3	33.00	6.8
4	30.59	8.8
5	30.30	9.6
6	26.07	7.5
7	30.68	cp∗
8	19.23	4.8
9	35.09	og#
10	30.80	og#
11	41.25	4.6
12	73.00	og#
13	141.44	3.7
14	123.82	4.7
15	98.95	3.7
16	119.46	4.2
17	141.44	4.7
18	86.98	5.4
19	101.78	6.3
20	11.59	5.9
21	153.33	3.6
22	153.44	3.5
23	173.47	5.6
24	173.87	5.4
25	174.06	og#
26	180.25	og#
27	196.74	3.2
28	198.60	4

^aCalculated as α IC-XE/IC-XN, where α is determined by IC-7N/IC-7E. C-X is the carbon number, C-7 is the reference carbon, IC-XN is the intensity of the NMR signal of carbon X naturally enriched, and IC-XE is the intensity of the NMR signal of carbon X enriched in the presence of [1,2-¹³C₂]acetate. The calculation takes into account the experimental ¹³C NMR conditions. cp∗, C₁ pool; og#, glutamate origin.