3.3.4. Benzocamphorin I (**4**)

Colorless syrup; IR (KBr) νmax: 3276, 2936, 2892, 1496, 1457, 1443, 1232, 1115, 1070, 1051, 956 cm<sup>−</sup>1; UV (MeOH) λmax: 265, 284 nm; ESI-MS *m*/*z* 385 [M + Na]+; HR-ESI–MS *m*/*z* 385.0898 ([M + Na]+) (Calcd. for C18H18O8Na: 385.0899); 1H-NMR (CDCl3, 400 MHz) δ 6.00 (2H, OCH2O-2- ,3- ), 5.98 (2H, OCH2O-3- ,4- ), 5.97 (1H, s, H-6- ), 5.17 (1H, s, OH-5), 3.90 (3H, s, OCH3-4), 3.89 (3H, s, OCH3-2- ), 2.05 (3H, s, CH3-1- ), 1.99 (3H, s, CH3-1). 13C-NMR (CDCl3, 100 MHz) δ 136.8 (C-3, 137.4 (C-2- ), 136.1 (C-6, C-3- ), 135.5 (C-5- ), 135.0 (C-4), 134.4 (C-2), 133.4 (C-4- ), 129.4 (C-5), 116.9 (C-1), 109.5 (C-6- ), 101.8 (OCH2O-3- ,4- ), 101.8 (OCH2O-2, 3), 60.1 (OCH3-4), 60.0 (OCH3-2), 59.8 (OCH3-2- ), 15.9 (CH3-1- ), 9.4 (CH3-1).
