“…Trichocitrinovirene A ( 1 ) was isolated as a colorless gum and had the molecular formula C 15 H 22 O 5 on the basis of the HRESIMS peak at m / z 305.1359 [M + Na] + . The IR spectrum exhibited absorption bands at 3336, 1684, and 1649 cm −1 for hydroxy, conjugated carboxyl carbonyl, and double bond functional groups, respectively [ 10 ]. The 1 H NMR spectrum ( Table 1 ) displayed characteristic signals for two olefinic protons of two trisubstituted alkenes (δ H 6.64, d, J = 10.5 Hz, and 5.31, s, each 1H), two methine protons (δ H 3.06 and 1.35, each m, 1H), one set of equivalent oxymethylene protons (δ H 3.92, s, 2H), three sets of nonequivalent methylene protons (δ H 3.40 and 3.30, each d, J = 16.8 Hz, 1H; δ H 2.13 and 2.04, each m, 1H; δ H 1.81 and 1.39, each m, 1H), and an isopropyl group (δ H 1.71, m, 1H, and δ H 0.95 and 0.82, each d, J = 6.9 Hz, 3H).…”