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. Hz, 69 (s, 3H, 22 or 23), 1.61 (s, 3H, 22 or 23), 1.51 (m, 2H, 10), 1.40?1.28 (m, 6H, pp.95-112

C. Nmr, CDCl 3 , 100 MHz) 168

C. Nmr, CDCl 3 , 100 MHz) 164

Z. For-the-mixture-of, 16 and/or 17)

1. Hz, J. =. Minor-isomerd, 1. Hz, 1. Minor-isomer, and . Major-isomer, 10 (td, J = 2.1, 9.8 Hz, 1H, major isomer, 5), 3.00 (td, J = 2.1, 9.2 Hz, 1H, minor isomer, 5), 2.08?1.84 (m, 3H, both isomers, 4 and 9), 1.67?1.34 (m, 1H, both isomers, 4), 1.65 (s, 3H, major isomer, 12 or 13), 1.64 (s, 3H, minor isomer, 12 or 13), 1.51 (s, 3H, major isomer, 12 or 13), 1.47 (s, 3H, minor isomer, pp.4-7568220602