Mass Spectra Analyses of Amides and Amide Dimers of Steviol, Isosteviol, and Steviolbioside

Table 1

Main ions observed in FAB mass spectra of compounds 5, 6, and 7.

Compd.		FAB ions: m/z (rel. abundance %)	[M + Na]^+[M+H]^+Cald./Measd.
5a	𝑛=2	1331(10), 1332(7), 775(2), 661(10),
		643(6), 307(12), 154(100), 137(56),
		136(90), 107(39), 95( 37), 73(51), 55(81)	1309.6	1331.0
5b	𝑛=4	1360(4), 1359(5), 690(7), 689(13), 671(6)
		625(5), 581(6), 537(7), 493(6), 449(5)
		391(6), 308(7), 307(32), 289(22), 255(10)	1337.6	1360.0
		154(100), 136(95)
5c	𝑛=5	1373(32), 1374(24), 1375(9), 1239(3), 1049(4),
		817(6), 703(9), 685(7), 619(8), 493(6), 363(5),
		154(73), 55(100)	1351.6	1373.0
5d	𝑛=7	1401(4),1379(1), 876(2), 731(67), 713(31),
		714(18), 391(85), 392(38), 391(85), 308(22),
		307(72), 289(63), 279(27), 222(35), 219(21),
		154(100), 136(98)	1379.7	1401.0
5e	𝑛=8	1415(8), 1416(4), 1091(3), 859(3), 745(17),
		727(9), 329(12), 307(36), 289(26), 255(19),
		154(100), 136(97)	1393.7	1415.0
5f	𝑛=10	1444(9), 1443(12), 1309(2), 773(5),619(4),
		338(11), 155(20), 154(75), 152(12),138(25),
		137(43), 136(67), 109(27), 105(35), 91(68),
		81(52), 77(61), 67(51), 55(100)	1421.7	1443.0
5g	𝑛=12	1471(4), 1472(2), 1175(1), 1148(2), 915(2), 801(14),
		783(7), 619(4), 338(13), 307(14), 155(38),
		154(100), 137(67), 136(92), 109(48), 105(55),
		77(69), 67(54),55(82)	1449.8	1471.0
6	𝑛=2	661 (23), 600(12), 579(9), 359(27), 341(47),
		267(32), 154(98), 57(100), 55(85)	660.5	661.5
7	𝑛=2	661(100), 344(25), 273(52), 177(15)	661.0	661.5