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Ethyl 4-methyl-2,6-dimethylene-4- (4-methylthiazol-2-yl)-heptanedioate (1b) was also isolated: 1 H NMR (400 MHz, CDCl3): d 6.63 (s, 1H), 4H), 2.91 (d, J = 13.2 Hz, 2H), p.478 ,
37 (s, 3H), 1.23 (s, 3H) ,