“…In the experiment, the fragmentation mechanisms of the 29 compounds were analyzed by using electrospray ionization ion trap mass spectrometry (ESIâITMS) and atmospheric pressure chemical ionization ion trap mass spectrometry (APCIâITMS) in the multiâstage MS full scan mode. These compounds included streblusol D ( 1 ), magonlignan A 4'â O âÎąâDâglucopyranoside ( 2 ), magnolol ( 3 ), magnaldehyde D ( 4 ), erythro âstrebluslignanol ( 5 ), threo âstrebluslignanoxiranol ( 6 ), strebluslignanphenol ( 7 ), threo âstrebluslignanol A ( 8 ), erythro âstrebluslignanol B ( 9 ), erythro âstrebluslignanol C ( 10 ), strebluslignanol D ( 11 ), strebluslignanone ( 12 ), (7' R ,8' R ,7" R ,8" R )â threo âstrebluslignanol F ( 13 ), (7' R ,8' S ,7" R ,8" S )â erythro âstrebluslignanol G ( 14 ), isomagnaldehyde ( 15 ), isostrebluslignaldehyde ( 16 ), isomagnolol ( 17 ), myricetin ( 18 ), naringenin ( 19 ), kaempferolâ3â O âβâDâglucopyranoside ( 20 ), kaempferolâ7â O âÎąâLârhamnoside ( 21 ), kaempferolâ3,7â O âÎąâLâdirhamnoside ( 22 ), kaempferolâ3â O âβâDâglucopyranosylâ7â O âÎąâLârhamnopyranoside ( 23 ), ginkgetin ( 24 ), Îąâboswellic acid ( 25 ), βâboswellic acid ( 26 ), oleanolic acid ( 27 ), βâamyrin ( 28 ) and βâamyrenone ( 29 ). Their structures are shown in Fig.…”