New Chlorinated 2,5-Diketopiperazines from Marine-Derived Bacteria Isolated from Sediments of the Eastern Mediterranean Sea

. 2020 Mar 26;25(7):1509. doi: 10.3390/molecules25071509

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Position	1 ²	2 ²	3 ^3,4	4 ⁴	5 ²	6 ^3,4	7 ²	8 ^3,4	9 ²	10 ²	11 ^3,4	12 ²	13 ²	14 ⁴	15 ^3,5	16 ^3,5
2	163.3	166.2	165.7	166.1	166.4	167.4	167.7	165.1	165.3	165.2	165.0	164.8	166.2	165.3	164.7	164.4
3	46.7	51.3	60.4	53.4	56.4	53.4	56.1	60.6	63.0	54.1	56.2	59.0	56.2	56.3	55.8	58.9
5	169.5	170.0	170.1	170.2	169.6	170.0	169.8	169.9	169.4	170.2	169.4	169.3	169.8	169.7	169.1	168.4
6	58.5	59.4	58.8	59.0	58.1	57.3	56.2	58.9	58.4	59.6	59.1	57.7	57.4	59.1	59.0	57.6
7	28.5	28.2	28.6	28.1	29.1	37.8	36.8	28.6	29.5	28.2	28.3	28.9	37.7	28.2	28.2	28.7
8	22.4	22.8	22.4	23.3	23.1	68.6	68.1	22.4	22.1	22.8	22.5	21.7	68.2	22.3	22.4	21.5
9	45.4	45.5	45.2	45.5	45.7	54.5	54.0	45.2	45.7	45.5	45.5	45.1	54.4	45.3	45.3	45.1
10		16.2	28.4	38.6	42.6	38.5	42.2	35.3	39.7	23.2	36.8	40.5	36.7	35.9	35.5	39.2
11			16.1	24.7	24.5	24.9	24.6	24.1	24.6	49.4	135.9	135.3	135.8	126.5	128.8	128.4
12			19.2	21.2	21.4	21.7	21.5	12.2	11.4	38.5	129.3	129.9	129.3	130.4	129.3	129.7
13				22.7	22.3	23.6	23.0	16.0	15.4		129.1	128.8	129.2	116.0	120.2	120.0
14											127.6	127.3	127.6	155.9	150.6	150.8
15											129.1	128.8	129.2	116.0	116.7	116.3
16											129.3	129.9	129.3	130.4	129.0	129.5
17
18
19
20

¹ In CDCl₃ for 1–28 and 30–32 and in CD₃OD for 29. ² Adapted (and revised when appropriate) as follows: 1 [25], 2 [27], 5 [31], 7 [35], 9 [37], 10 [38], 12 [40], 13 [41], 17 [44], 21 [37], 23 [17], 27 [17], 29 [54]. ³ Determined through HMBC correlations. ⁴ Recorded at 100 MHz. ⁵ Recorded at 237.5 MHz. ⁶ Recorded at 175 MHz. ⁷ Recorded at 150 MHz. ⁸ nd: not detected.