entecavir hydrate

CHEBI:59902 ·resolve ·ANTIVIRAL ·EXACT SEEDED

The monohydrate form of entecavir. A synthetic analogue of 2'-deoxyguanosine, entecavir is a nucleoside reverse transcriptase inhibitor with selective antiviral activity against hepatitis B virus. It is phosphorylated intracellularly to the active triphosphate form, which competes with deoxyguanosine triphosphate, the natural substrate of hepatitis B virus reverse transcriptase, inhibiting every stage of the enzyme's activity, although it has no activity against HIV. Enteclavir is used for the treatment of chronic hepatitis B. — 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.

Label unavailable CHEBI:35505

Chemical structure

Computed structure properties
Molecular formula	C12H15N5O3.H2O
Charge	0
Average mass	295.299 Da
Monoisotopic mass	295.12805 Da
Source	ChEBI
InChIKey	YXPVEXCTPGULBZ-WQYNNSOESA-N

SMILES

C=C1[C@H](CO)[C@@H](O)C[C@@H]1n1cnc2c(=O)nc(N)nc21.O

InChI

InChI=1S/C12H15N5O3.H2O/c1-5-6(3-18)8(19)2-7(5)17-4-14-9-10(17)15-12(13)16-11(9)20;/h4,6-8,18-19H,1-3H2,(H3,13,15,16,20);1H2/t6-,7-,8-;/m0./s1

Also called

2-amino-9-[(1S,3R,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylidenecyclopentyl]-1,9-dihydro-6H-purin-6-one—water (1/1) (EXACT_SYNONYM)— chebi
9-((1S,3R,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl)guanine monohydrate (EXACT_SYNONYM)— chebi
entecavir (EXACT_SYNONYM)— chebi
entecavir monohydrate (EXACT_SYNONYM)— chebi

Cross-references

Identifiers for this same structure in other resources. An accession that lands on two different structures in this corpus is withheld from both rather than shown here, since it names at most one of them.

cas:209216-23-9

Drug registries

Identifiers that name a drug rather than a structure. One of these can cover a parent compound, its salts and its stereoisomers, which this corpus keeps as separate records, so it is not an equivalence of structure.

Activity roles

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

antiviral drug CHEBI:36044
EC 2.7.7.49 (RNA-directed DNA polymerase) inhibitor CHEBI:59897

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:59902`	entecavir hydrate	`antibioticmech:chebi-de37749b35`	2026-08-30

Mechanism summary

Mode of action: VIRAL_POLYMERASE_INHIBITION host shared target — Assigned from ChEBI role CHEBI:59897 (EC 2.7.7.49 (RNA-directed DNA polymerase) inhibitor). ChEBI asserts the role on the compound. The target it names is one the host has too, so the mechanism is true but is not evidence of selectivity — see mode_of_action_target_scope. Not a curator's mechanistic review.
Clinical status: APPROVED

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
RESEEDED_FROM_SOURCES 2026-08-31 · seed_from_sources
Re-seeded from updated data/raw/ inventories
RESEEDED_FROM_SOURCES 2026-08-31 · seed_from_sources
Re-seeded from updated data/raw/ inventories
RESEEDED_FROM_SOURCES 2026-09-10 · 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 (YAML).

Explore across X-Mech: MediaIngredientMech (entecavir hydrate) · CultureMech · NaturalProductMech · PathwayMech · TraitMech