Enhancement of Antibacterial Activity of Paludifilum halophilum and Identification of N-(1-Carboxy-ethyl)-phthalamic Acid as the Main Bioactive Compound

Table 5

Structure and ¹H and ¹³C chemical shift assignments of N-(1-carboxy-ethyl)-phthalamic acid based on the H-H COSY (—) and HMBC (H⟶C) correlations.

Atom	δC (ppm)	δH (ppm); m; J (Hz)	H-H COSY	HMBC
1	1218	—	—	—
2	138.0	—	—	—
3	122.4	8.30 (d, 8.2)	7.47	123.9
4	132.4	7.47 (t, 8.4)	8.30–7.14	126.4–138.0
5	123.9	7.14 (t, 7.5)	7.47–7.55	122.4
6	126.4	7.55 (d, 7.8)	7.14	132.4–138.0–167.9
7	171.2	—	—	—
8 (NH)	—	6.94 (d, 7.8)	4.98	—
9	50.6	4.98 (m)	6.94–1.60	19.1–170.5
10	19.1	1.60 (d, 6.8)	4.98	50.6–170.5
11	170.5	—	—	—
12	167.9	—	—	—