colossolactone VIII

CHEBI:65651 ·resolve ·ANTIVIRAL ·EXACT SEEDED

A tetracyclic triterpenoid that is A,B-dihomo-19-nor-4-oxalanosta-1,8,19,24-tetraen-26,22-olide substituted by an acetoxy group at position 15, a hydroxy group at position 23 and an oxo group at position 3 (the 22S, 23R stereoisomer). It is isolated from the fruiting bodies of the Vietnamese mushroom Ganoderma colossum and displays inhibitory activity towards the enzyme HIV protease. — 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:26893 CHEBI:26893
CHEBI:35681 CHEBI:35681
CHEBI:47622 CHEBI:47622
CHEBI:50239 CHEBI:50239

Chemical structure

Computed structure properties
Molecular formula	C32H42O7
Charge	0
Average mass	538.681 Da
Monoisotopic mass	538.29305 Da
Source	ChEBI
InChIKey	XNFBOJFRJTXMJL-OZXCYFAESA-N

SMILES

[H][C@@]1([C@@H](C)[C@@]2([H])C[C@@H](OC(C)=O)[C@@]3(C)C4=C(C=C5C=CC(=O)OC(C)(C)[C@]5([H])CC4)CC[C@]23C)OC(=O)C(C)=C[C@H]1O

InChI

InChI=1S/C32H42O7/c1-17-14-25(34)28(38-29(17)36)18(2)24-16-26(37-19(3)33)32(7)23-10-9-22-20(8-11-27(35)39-30(22,4)5)15-21(23)12-13-31(24,32)6/h8,11,14-15,18,22,24-26,28,34H,9-10,12-13,16H2,1-7H3/t18-,22+,24+,25+,26+,28-,31+,32+/m0/s1

Also called

(1R,3R,3aR,11aR,13bR)-3-{(1S)-1-[(2S,3R)-3-hydroxy-5-methyl-6-oxo-3,6-dihydro-2H-pyran-2-yl]ethyl}-3a,11,11,13b-tetramethyl-9-oxo-1,2,3,3a,4,5,9,11,11a,12,13,13b-dodecahydroindeno[5',4':4,5]cyclohepta[1,2-c]oxepin-1-yl acetate (EXACT_SYNONYM)— chebi
(22S, 23R)-A,B-dihomo-19-nor-15-β-acetoxy-23-hydroxy-4-oxa-3-oxolanosta-1,8,19,24-tetraen-26,22-olide (EXACT_SYNONYM)— chebi

Cross-references

Equivalent identifiers for this same structure in other resources.

reaxys:18836345

Activity roles

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

CHEBI:35660 CHEBI:35660

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:65651`	colossolactone VIII	`antibioticmech:chebi-b7be2c1131`	2026-08-30

Mechanism summary

Mode of action: VIRAL_PROTEASE_INHIBITION microbial target — Assigned from ChEBI role CHEBI:35660 (HIV protease 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.