## 3 Results and Discussion
### Identification of Flavonoids in Fig Leaves
There was a difference of 120 mass units between it and \(m/z\) 563. We speculated that it was produced by 0-2 cracking of the hexosyl part of [M - H]\({}^{-}\). Due to the difference of 90 mass units between \(m/z\) 563 \(\rightarrow\) 473, we speculated that \(m/z\) 473 was caused by 0-3 cracking of the hexosyl part of [M - H]\({}^{-}\). The difference between \(m/z\) 563 \(\rightarrow\) 353 was 120 + 90 mass units. We speculated that [M - H]\({}^{-}\) 0-2 cracking of hexose and pentose occurred simultaneously in the ESI source. The difference between \(m/z\) 563 \(\rightarrow\) 383 was 120 + 60 mass units. We speculated that [M - H]\({}^{-}\) 0-2 cracking of pentose and 0-3 cracking of hexose may have occurred simultaneously in the ESI source. The difference between \(m/z\) 563 \(\rightarrow\) 503 was 60 mass units. Presumably, [M - H]\({}^{-}\) 0-3 cracking of the pentose occurred in the ESI source. The main ion fragments appearing in the secondary mass spectrum were similar to those in the description of the cleavage behavior of the sugar moiety of flavonoid glycosides in the literature. Compound **6** (\(\rm t_{R}=13.02\) min) showed the \(\rm[M-H]^{-}\) ion at \(m/z\) 473.1115, and the MS/MS mainly produced characteristic fragment ions of carbon glycosides: \(m/z\) 443.1001, 353.0670. It was identified as kaempfer 6-C-hexoside-8-C-hexoside [44]. The cleavage rules for ischafotaside and kaempfer 6-C-hexoside-8-C-hexoside were the same, but the peak order was different. Kaempfer 6-C-hexoside-8-C-hexoside was in the front; ischafotaside was in the back. Compound **5** (\(\rm t_{R}=12.87\) min) showed an MS spectrum for the \(\rm[M-H]^{-}\) ion at \(m/z\) 447.0934 and the product ions at \(m/z\) 369.0615, 357.0622, 327.0511, 297.0397, 285.0396, and 133.0280. It was identified as quercetin 6-C-hexobioside [45]. The available molecular formula is C\({}_{21}\)H\({}_{20}\)O\({}_{11}\). Among these, \(m/z\) 369.0615 represents the fragment ion [M-H-C\({}_{2}\)H\({}_{6}\)O\({}_{3}\)]\({}^{-}\) after the precursor ion had lost 78 Da. The \(m/z\) 357.0622 represents the fragment ion [M-H-C\({}_{3}\)H\({}_{6}\)O\({}_{3}\)]\({}^{-}\) after the precursor ion had lost 90 Da. The \(m/z\) 327.0511 represents the fragment ion after the precursor ion had lost 120 Da, [M-H-C\({}_{4}\)H\({}_{6}\)O\({}_{4}\)]\({}^{-}\). The \(m/z\) 297.0397 represents the fragment ion after the precursor ion had lost 180 Da, [M-H-C\({}_{5}\)H\({}_{10}\)O\({}_{5}\)]\({}^{-}\). The \(m/z\) 285.0396 represents the fragment ion [M-H-C\({}_{6}\)H\({}_{10}\)O\({}_{5}\)]\({}^{-}\) after the precursor ion had lost 162 Da. It is the aglycon of the compound after removing glucose. The \(m/z\) 133.0280 represents the fragment ion of this compound after RDA fragmentation, [M-H-C\({}_{7}\)H\({}_{4}\)O\({}_{4}\)]\({}^{-}\). Compound **8** (\(\rm t_{R}=14.02\) min) showed the \(\rm[M-H]^{-}\) ion at \(m/z\) 577.1577, and the product ions at \(m/z\) 457.1164 and 293.0454 were detected. We speculated that there was glucose in the structure of the compound and that the link between sugar and the parent nucleus was carbon glycoside. The molecular ion peak was \(m/z\) 577 \(\rm[M-H]^{-}\). Then, a fragment ion peak of [M-H-120]\({}^{-}\) appeared. We observed that it cleaved off the ion C\({}_{4}\)H\({}_{8}\)O\({}_{4}\), and the original structure may have been replaced by hexose. In addition, the position of the pentose phosphate pathway easily merged with the parent ring, and the hydroxyl group was dehydrated and broken and lost 164, forming \(m/z\) 413 [M-H-164]\({}^{-}\). When position 120 of hexose was closed again, \(m/z\) 293 [M-H-120]\({}^{-}\) was formed. Thus, Compound **8** was identified as apigenin 2\({}^{\prime\prime}\)-O-pentoside [46]. Compound **9** (\(\rm t_{R}=14.14\) min) showed the \(\rm[M-H]^{-}\) ion at \(m/z\) 432.1029, and the product ions at \(m/z\) 341.0673, 311.0564, and 283.0612 were generated. In the process of sugar chain cleavage, one molecule of C\({}_{3}\)H\({}_{6}\)O\({}_{3}\) was lost to generate fragment ions [M-H-90]\({}^{-}\).