Euchrenone-b3doi:10.1007/978-1-4614-0535-1_7931 H NMR (270 MHz, CDCl 3 ): 1.50 ( 6H, br s, 2Me), 1.66, 1.80 (each 3H, s, 2Me) 3.40 (2H, d, J = 6.7, Ar- CH 2 -CH = C), 5.75 (1H, d, J = 10, H-5″), 6.00 (2H, s, O-CH 2 -O), 6.74 (1H, d, J =...