Table 1 The main m/z values observed from negative full scan with LC–TOF–MS for GCE

Peak	Main observed masses of LC–TOF–MS (m/z)^a	Corresponding compounds^b
1	663.159 4 [2M–H]⁻, 331.079 1 [M–H]⁻	1GG
2	339.044 8 [2M–H]⁻, 169.020 0 [M–H]⁻	GA isomer
3	339.044 9 [2M–H]⁻, 169.020 2 [M–H]⁻	GA
4	483.091 7 [M–H]⁻	2GG
5	483.089 5 [M–H]⁻	2GG isomer
6	635.105 8 [M–H]⁻	3GG
7	635.104 7 [M–H]⁻	3GG isomer
8	635.102 7 [M–H]⁻	3GG isomer

GCE, Galla chinensis extract; LC–TOF–MS, liquid chromatography–time of flight–mass spectrometry.
^a The mass spectrometry was worked at least 2 µg⋅g⁻¹ accuracy.
^b 1–3GGs represented galloylglucopyranose, di-galloylglucopyranose and tri-galloylglucopyranose, respectively.

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