(−)-calanolide B

CHEBI:65553 ·resolve ·ANTIVIRAL ·EXACT SEEDED

An organic heterotetracyclic compound that is 11,12-dihydro-2H,6H,10H-dipyrano[2,3-f:2',3'-h]chromen-2-one substituted by a hydroxy group at position 12, methyl groups at positions 6, 6, 10 and 11 and a propyl group at position 4 (the 10S,11R,12S stereoisomer). Isolated from Calophyllum lanigerum var austrocoriaceum and Calophyllum brasiliense, it exhibits potent activity against HIV-1 reverse transcriptase. — ChEBI

Machine-generated and unreviewed. Identity, structure and cross-references come straight from ChEBI's and CARD's own data; no curator has signed off on this record yet.

Classification

Strictly broader compounds or drug classes this molecule belongs to.

CHEBI:18946 CHEBI:18946
CHEBI:35681 CHEBI:35681
CHEBI:37407 CHEBI:37407
CHEBI:38163 CHEBI:38163

Chemical structure

Computed structure properties
Molecular formula	C22H26O5
Charge	0
Average mass	370.445 Da
Monoisotopic mass	370.17802 Da
Source	ChEBI
InChIKey	NIDRYBLTWYFCFV-PZROIBLQSA-N

SMILES

CCCc1cc(=O)oc2c3c(c4c(c12)OC(C)(C)C=C4)O[C@@H](C)[C@H](C)[C@@H]3O

InChI

InChI=1S/C22H26O5/c1-6-7-13-10-15(23)26-21-16(13)20-14(8-9-22(4,5)27-20)19-17(21)18(24)11(2)12(3)25-19/h8-12,18,24H,6-7H2,1-5H3/t11-,12-,18-/m0/s1

Also called

(10S,11R,12S)-12-hydroxy-6,6,10,11-tetramethyl-4-propyl-11,12-dihydro-2H,6H,10H-dipyrano[2,3-f:2',3'-h]chromen-2-one (EXACT_SYNONYM)— chebi
(+)-(10S,11R,12S)-10,11-trans-dihydro-12-hydroxy-6,6,10,11-tetramethyl-4-propyl-2H,6H-benzo[1,2-b:3,4-b':5,6-b'']tripyran-2-one (EXACT_SYNONYM)— chebi
(10S,11R,12S)-11,12-dihydro-12-hydroxy-6,6,10,11-tetramethyl-4-propyl-2H,6H,10H-benzo(1,2-b:3,4-b':5,6-b'')tripyran-2-one (EXACT_SYNONYM)— chebi
costatolide (EXACT_SYNONYM)— chebi

Cross-references

Equivalent identifiers for this same structure in other resources.

cas:909-14-8
patent:WO9932492
reaxys:7257193

Activity roles

Every antimicrobial role a source asserts for this compound — the unreduced evidence behind its antimicrobial_class.

CHEBI:53756 CHEBI:53756

Source concepts

Every upstream concept that resolved to this record. The merge is the product: this is what shows ChEBI and CARD are describing the same structure.

Upstream concepts merged into this record
Source	Native ID	Label	Minted CURIE	Version
CHEBI	`CHEBI:65553`	(−)-calanolide B	`antibioticmech:chebi-df521c82f4`	2026-08-30

Mechanism summary

Mode of action: VIRAL_POLYMERASE_INHIBITION microbial target — Assigned from ChEBI role CHEBI:53756 (HIV-1 reverse transcriptase inhibitor). ChEBI asserts the role on the compound. The role names a target specific to the microbe or virus — see mode_of_action_target_scope. Not a curator's mechanistic review.

Curation history

SEEDED_FROM_SOURCES 2026-08-30 · seed_from_sources
Seeded from data/raw/ inventories (CHEBI)
RESEEDED_FROM_SOURCES 2026-08-30 · seed_from_sources
Re-seeded from updated data/raw/ inventories
RESEEDED_FROM_SOURCES 2026-08-30 · seed_from_sources
Re-seeded from updated data/raw/ inventories

Provenance

Seeded by scripts/seed_from_sources.py from the committed inventories in data/raw/. View the record.