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. 2002 Aug 31;7(8):628–640. doi: 10.3390/70800628
2a: (R = Me) 52% 3a: (R = Me) 7% 4a: (R = Me) 31%
2b: (R = Et) 81% 3b: (R = Et) 4% 4b: (R = Et) 12%
2c: (R =i-Pr) 73% 3c: (R =i-Pr) 6% 4c: (R =i-Pr) 12%
2d: (R = i-Bu) 78% 3d: (R = i-Bu) 3% 4d: (R = i-Bu) 16%