Natamycin
A macrolide antibiotic that has formula C33H47NO13, produced by several Streptomyces species including Streptomyces natalensis. It exhibits broad spectrum antifungal activity and used in eye drops, and as a food preservative, and also as a postharvest biofungicide for citrus and other fruit crops. — ChEBI
Safety documents & references
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Identity & molecular properties
Source-linked values| CAS number | 7681-93-8 | ChEBI ↗ |
| Molecular formula | C33H47NO13 | ChEBI ↗ |
| Molar mass | 665.733 g/mol | ChEBI ↗ |
| Monoisotopic mass | 665.30474 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:7488 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 665.7 g/mol | PubChem ↗ |
| Exact mass | 665.30474055 Da | PubChem ↗ |
| Computed XLogP | -1.3 | PubChem ↗ |
| Topological polar surface area (Ų) | 231 | PubChem ↗ |
| H-bond donors | 7 | PubChem ↗ |
| H-bond acceptors | 14 | PubChem ↗ |
| Rotatable bonds | 3 | PubChem ↗ |
PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.
Names & structural identifiers
Copy any identifiernatamycin(1R,3S,5R,7R,8E,12R,14E,16E,18E,20E,22R,24S,25R,26S)-22-[(3-amino-3,6-dideoxy-beta-D-mannopyranosyl)oxy]-1,3,26-trihydroxy-12-methyl-10-oxo-6,11,28-trioxatricyclo[22.3.1.0(5,7)]octacosa-8,14,16,18,20-pentaene-25-carboxylic acidNCXMLFZGDNKEPB-FFPOYIOWSA-N[H][C@@]12C[C@H](O)C[C@]3(O)C[C@H](O)[C@@H](C(=O)O)[C@]([H])(C[C@@H](O[C@@H]4O[C@H](C)[C@@H](O)[C@H](N)[C@@H]4O)/C=C/C=C/C=C/C=C/C[C@@H](C)OC(=O)/C=C/[C@H]1O2)O3InChI=1S/C33H47NO13/c1-18-10-8-6-4-3-5-7-9-11-21(45-32-30(39)28(34)29(38)19(2)44-32)15-25-27(31(40)41)22(36)17-33(42,47-25)16-20(35)14-24-23(46-24)12-13-26(37)43-18/h3-9,11-13,18-25,27-30,32,35-36,38-39,42H,10,14-17,34H2,1-2H3,(H,40,41)/b4-3+,7-5+,8-6+,11-9+,13-12+/t18-,19-,20+,21+,22+,23-,24-,25+,27-,28+,29-,30+,32+,33-/m1/s1Names & synonyms
Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.
Classification & relationships
ChEBI ontologyRoles recorded in ChEBI
Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.
Mass ↔ amount of substance
Calculated from sourced massUses 665.733 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsCOHNCalculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.
Research & patent references
Selected source associationsSources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.