Identification of the constituents relied upon direct comparison (m.m.p., IR, PMR, co-TLC) of IIIb and of IV resp. with (6S)-dihydromethysticin3 and anibine;2 and upon comparison of m.p. and UV spectra of IIIa and of IIIc with lit. data resp. of dihydrokawain6,7 and tetrahydroiangonin.6,7 Tetrahydro-11-methoxyiangonin (IIId). White plates, m.p. 121-123° (C6H6). v_max (cm-1): 1708, 1694, 1623, 1526, 1412, 1389, 1370, 1281, 1252, 1230, 1220, 1154, 1134, 1040, 1028, 1002, 988, 830, 817, 645. λ_FQY^FQY(nm): 231, 277, 284sh (τ 17 800, 3400, 2800). PMR (CDCl3, τ) of IIIa,b,c,d: 4.88 (s, H-3), 5.40-5.90 (m, H-6), 6.33 (s, OCH3), 7.15–7.35 (m, ArCH2), 7.55–7.75 (m, two H-5), 7.80–8.25 (m, ArCH2CH2). Additional features of the PMR spectra of IIIa: 2.87 (s, five ArH). IIIb: 3.37 (s, three ArH), 4.14 (s, O2CH2). IIIc: 2.90 and 3.20 (approx. doublets, J8 Hz, AA'BB' system), 6.23 (s, OCH3). IIId: 3.30 (s, three ArH), 6.21 (s, OCH3), 6.25 (s, OCH3). MS. IIIa: M 232 (60%), m/e 91 (100%). IIIb: M 276 (97%), m/e 135 (70%). IIIc: M 262 (37%), m/e 121 (100%). IIId: 292 (45%), m/e 151 (100%). ORD (EtOH, c 1.0, 400–210 nm).IIIa: [φ]317 O, [φ]248 O, [φ]248 O, [φ]255 - 20 880. IIIb: [φ]298 O, [φ]260 +12 420, [φ]6 HÄNSEL, R., LANGHAMMER, L. and RIMPLER, H. (1967) Arch. Pharm. 300, 157.7 KLOHS, M. W., KELLER, F., WILLIAMS, R. E., TOEKES, M. I. and KRONHEIM, G. E. (1959) J. Med. Pharm. Chem. 1, 95.