Table 1.

UFLC-MS/MS data for compounds identified in MaPLES by comparison of retention times (tR) and mass spectral data with authentic lignan standards previously isolated and identified (by NMR) from maple syrup.^{8, 9}

No.	Compounds	tR (min)	[M+Na]+ (m/z)	MS/MS (m/z)
1	leptolepisol D	20.96	539	539, 491
2	lyoniresinol	40.76	443	–a
3	guaiacylglycerol-β-O-4′-coniferyl alcohol	45.53	399	399, 201
4	threo-guaiacylglycerol-β-O-4′-dihydroconiferyl alcohol	52.85	401	401, 203
5	erythro-guaiacylglycerol-β-O-4′-dihydroconiferyl alcohol	62.19	401	401, 203
6	5-(3′′,4′′-dimethoxyphenyl)-3-hydroxy-3-(4′-hydroxy-3′-methoxybenzyl)-4-(hydroxymethyl)dihydrofuran-2-one	64.03	427	427, 409, 379, 365, 217
7	[3-[4-[(6-deoxy-α-L-mannopyranosyl)oxy]-3-methoxyphenyl]methyl]-5-(3,4-dimethoxyphenyl)-dihydro-3-hydroxy-4-(hydroxymethyl)-2(3H)-furanone	76.78	573	573, 525, 511, 427, 409, 379
8	erythro-1-(4-hydroxy-3-methoxyphenyl)-2-[4-(3-hydroxypropyl)-2,6-dimethoxyphenoxy]-1,3-propanediol	86.54	431	431, 233, 219
9	secoisolariciresinol	96.89	385	–a
10	dehydroconiferyl alcohol	109.28	383	–a
11	5′-methoxydehydroconiferyl alcohol	116.31	413	–a
12	icariside E4	119.74	529	529, 383
13	sakuraresinol	133.10	487	487, 411, 395, 381
14	acernikol	141.29	441	–a
15	syringaresinol	180.76	609	–a
16	buddlenol E	197.45	607	607, 411, 395
17, 17′	(1S,2R)-2-[2,6-dimethoxy-4-[(1S,3aR,4S,6aR)-tetrahydro-4-(4-hydroxy-3,5-dimethoxyphenyl)-1H,3H-furo[3,4-c]furan-1-yl]phenoxy]-1-(4-hydroxy-3-methoxyphenyl)-1,3-propanediol	200.50 202.07	637 637	637, 441, 425 637, 441, 425
18	2-[4-[2,3-dihydro-3-(hydroxymethyl)-5-(3-hydroxypropyl)-7-methoxy-2-benzofuranyl]-2,6-dimethoxyphenoxy]-1-(4-hydroxy-3-methoxyphenyl)-1,3-propanediol	206.31	609	609, 413

^acompound identified in MaPLES by comparison of retention times (tR) and [M+Na]⁺ with authentic lignan standards previously isolated and identified from maple syrup.^{8, 9}