Retention time (RT), UV and mass spectral characteristics, and tentative identification of putative bioactive compounds in PEO.

Peak no.	RT (min)	UV	[M–H]−	Main fragments	Tentative identification
1	13.35	279	289	245	Catechin
2	16.39	279	577	289	Procyanidin dimer
3	16.65	269	287	269	3,7,3′,4′′-Tetrahydroxyflavanone
4	17.11	270	579	271, 151	Trihydroxyflavanone-o-deoxyhexosyl-O-hexoside
5	18.68	279	577	289	Procyanidin dimer
6	20.64	279	597	289	Catechin-3-O-rutinoside
7	21.52	321	367	173	4-Feruloylquinic acid
8	23.05	269	271	135	7,3′,4′-Trihydroxyflavanone
9	23.71	320	335	173	Shikimic acid hexoside isomer I
10	24.21	321	335	173	Shikimic acid hexoside isomer II
11	24.67	321	371	—	Caffeoylglucaricacid
12	28.85	229	327	—	Trihydroxy-octadecadienoicacid
13	29.90	229	329	—	Trihydroxy-octadecenoicacid
14	34.44	237	573	—	Cucurbitacin A
15	43.96	229	295	—	9-/or 13-Hydroxy-9Z,11E-octadecadienoic acid
16	47.53	237	515	—	Cucurbitacin D
17	48.16	239	555	357	Cucurbitacin E
18	52.82	229	277	—	Linolenic acid
19	56.28	239	559	—	Dihydro-cucurbitacin B
20	59.55	237	807	—	Colocynthoside B
21	60.84	230	281	—	Oleic acid
22	63.94	239	557	—	Cucurbitacin B