Table 2 1 H in Chemical constituents derived from Artocarpus xanthocarpus as inhibitors of melanin biosynthesis

Table 2 1 H (400 MHz) and 13 C NMR (100 MHz) spectroscopic data of compounds 3–5.
Position3 (acetone- d 6)4 (acetone- d 6)5 (chloroform- d 1)δ C, mult.δ H (J in Hz)δ C, mult.δ H (J in Hz)δ C, mult.δ H (J in Hz)2154.3, C154.1, C152.1, C3107.6, CH6.62, s108.6, CH6.71, s107.5, CH6.61, s3a122.8, C122.8, C122.1, C4122.3, CH7.42, d (8.4)122.3, CH7.42, d (8.4)121.1, CH7.39, d (8.4)5113.4, CH6.82, dd (8.4, 2.0)113.5, CH6.80, dd (8.4, 2.0)111.9, CH6.77, dd (8.4, 2.0)6156.8, C156.8, C153.4, C799.1, CH6.96, d (2.0)99.1, CH6.95, d (2.0)98.2, CH6.94, d (2.0)7a157.4, C157.4, C155.4, C827.8, CH23.14, d (7.2)27.9, CH23.15, m26.6, CH23.02-3.16, m9125.4, CH5.05, br t (7.2)125.5, CH5.06, br t (7.2)123.1, CH5.01, br t (7.2)10130.9, C130.9, C130.7, C1118.4, Me1.37, s18.4, Me1.38, s17.6, Me1.38, s1226.5, Me1.54, s26.5, Me1.54, s25.7, Me1.57, s1324.4, CH22.42-2.47, m30.5, CH22.58, dd (13.6, 10.4) 2.74, dd (13.6, 2.4)79.4, CH4.04, s1446.1, CH21.59-1.63, m77.9, CH3.59-3.63, m (10.4, 2.4)66.7, CH3.36, s1570.8, C78.3, C56.8, C1629.9, Me0.98, s21.3, Me0.93, s19.6, Me0.94, s1729.9, Me0.98, s22.1, Me0.96, s24.8, Me1.18, s1 0133.5, C134.5, C132.9, C2 0123.8, C124.2, C124.0, C3 0 a157.8, C158.2, C158.2, C4 098.6, CH6.80, s98.7, CH6.82, s97.2, CH6.60, s5 0 a158.0, C158.5, C157.1, C6 0125.6, C122.7, C119.7, COMe-1357.0, Me3.36, sOMe-1450.0, Me2.99, sOMe-3 0 b56.8, Me3.90, s56.9, Me3.90, s56.1, Me3.88, sOMe-5 0 b56.8, Me3.91, s57.0, Me3.91, s55.7, Me3.88, sOH-68.50, br s8.50, br s
The attached proton number of each carbon signal was verified by DEPT pulse sequence and confirmed by HMQC and HMBC 2D NMR spectra. a,b These values in each column may be interchanged.