Lanceolatin B

Lanceolatin B

Common Name: Lanceolatin B

Synonyms: 4H-1-Benzopyran-4-one, 2,3-dihydro-5,7-dihydroxy-3-[2-hydroxy-5-(5-hydroxy-7-methoxy-4-oxo-4H-1-benzopyran-2-yl)phenyl]-2-(4-hydroxyphenyl)-, (2R-trans)-

CAS Registry Number: 159194-99-7

InChI:

InChIKey:

Formula: C31H22O10

Molecular Weight: 554.507

Exact Mass: 554.1213

NMR Solvent: acetone-d6

MHz: 300 (1H)

Calibration: TMS

NMR references: Pegnyemb, D., Ghogomu-Tih, R., Sondengam, B., Martin, M., Bodo, B. (1994). Minor Biflavonoids of Lophira lanceolata. J. Nat. Prod. 57, 1275-1278.

Species: Lophira lanceolata - Pegnyemb, D., Ghogomu-Tih, R., Sondengam, B., Martin, M., Bodo, B. (1994). Minor Biflavonoids of Lophira lanceolata. J. Nat. Prod. 57, 1275-1278.

Notes:

Proton NMR Peaks

Position PPM Peak Type J (Hz)
3 6.53 s
5-OH 12.89 s
6 6.29 d 2.2
7-OCH3 3.86 s
8 6.58 d 2.2
2' 7.71 d 2.2
5' 6.98 d 8.2
6' 7.72 dd 8.2, 2.2
2" 5.91 d 12
3" 4.68 d 12
5"-OH 12.18 s
6" 6 d 2.2
8" 6 s
2''', 6''' 7.28 m
3''', 5''' 6.73 m