Chemical identity

Spiramycin EP Impurity B

CAS not listed · C43H76N2O14

01Identity

Identifiers and names for this exact compound. Empty fields are left unassigned.

Lazychem IDLC-32914
PubChem CID169446517
NameSpiramycin EP Impurity B
CAS RNNot listed
Molecular formulaC43H76N2O14
Molecular weight845.1 g/mol
IUPAC name(4R,5S,6S,7R,9R,10R,11E,13E,16R)-6-[(2S,3R,4R,5S,6R)-5-[(2S,4R,5S,6S)-4,5-dihydroxy-4,6-dimethyloxan-2-yl]oxy-4-(dimethylamino)-3-hydroxy-6-methyloxan-2-yl]oxy-10-[(2R,5S,6R)-5-(dimethylamino)-6-methyloxan-2-yl]oxy-4-hydroxy-7-(2-hydroxyethyl)-5-methoxy-9,16-dimethyl-1-oxacyclohexadeca-11,13-dien-2-one
InChIKeyIWOBTGVHVXKLCB-CEUOBAOPSA-N

02Structure identifiers

2D structurePubChem CID 169446517
Two-dimensional chemical structure of Spiramycin EP Impurity B
Two-dimensional structure for the PubChem identity linked to this record. Confirm the identifiers before analytical use.

The parsed structure contains 4 rings, includes aliphatic carbon, has 19 defined stereocentres. These statements are calculated from the published structure string.

Defined stereocentres19
Unassigned stereocentres0
Ring count4
Secondary amines0
Tertiary amines2
N-methyl amine sites4
SMILESC[C@@H]1C/C=C/C=C/[C@@H]([C@@H](C[C@@H]([C@@H]([C@H]([C@@H](CC(=O)O1)O)OC)O[C@H]2[C@@H]([C@H]([C@@H]([C@H](O2)C)O[C@H]3C[C@@]([C@H]([C@@H](O3)C)O)(C)O)N(C)C)O)CCO)C)O[C@H]4CC[C@@H]([C@H](O4)C)N(C)C
InChINot listed
Formula from structureC43H76N2O14
Molecular weight from structure845.1 g/mol

03Stereochemistry

The published structure contains 19 defined and 0 unassigned tetrahedral stereocentres. The exact wedge and dash depiction is shown above.

Defined centres19Structure assigned
Unassigned centres0Structure unspecified
Assignment statusFully assignedExact published identity
Tetrahedral upper bound≤ 524,288Before symmetry reduction

Published same-connectivity configurations

1 record

These records have the same connectivity, molecular formula and protonation layer, but a different complete InChIKey stereochemical layer. Only separately structure-linked records are shown.

No additional structure-linked configuration with the same connectivity is currently present in the LazyChem dataset.

Scope: The mathematical 2^n value is only an upper bound. Symmetry and other stereogenic elements can change the number of distinct stereoisomers. A hypothetical configuration is not published as a compound record without a verified structure identity.

04Possible N-nitroso structures

Shown for structural screening only. These candidates are not confirmed impurities, formation predictions or analytical findings.

Matched amine site2 candidates
Chemical structure of Spiramycin EP Impurity B with the matched amine site highlighted in amber
Amber identifies the screened atom and adjacent bonds.
Possible structure candidateUnverified identity
First calculated possible N-nitroso structure derived from Spiramycin EP Impurity B, with the new N-nitroso group highlighted in amber
The new N-N=O atoms and bonds are highlighted. No CAS number or compound name is assigned by this calculation.
Candidate 1Possible N-nitroso structural candidate
Calculated formula
C42H73N3O15
Candidate SMILES
CO[C@@H]1[C@@H](O[C@@H]2O[C@H](C)[C@@H](O[C@H]3C[C@@](C)(O)[C@@H](O)[C@H](C)O3)[C@H](N(C)N=O)[C@H]2O)[C@@H](CCO)C[C@@H](C)[C@@H](O[C@H]2CC[C@H](N(C)C)[C@@H](C)O2)/C=C/C=C/C[C@@H](C)OC(=O)C[C@H]1O
Candidate 2Possible N-nitroso structural candidate
Calculated formula
C42H73N3O15
Candidate SMILES
CO[C@@H]1[C@@H](O[C@@H]2O[C@H](C)[C@@H](O[C@H]3C[C@@](C)(O)[C@@H](O)[C@H](C)O3)[C@H](N(C)C)[C@H]2O)[C@@H](CCO)C[C@@H](C)[C@@H](O[C@H]2CC[C@H](N(C)N=O)[C@@H](C)O2)/C=C/C=C/C[C@@H](C)OC(=O)C[C@H]1O

Interpretation: A structural alert alone does not establish that a nitrosamine forms. Evaluate nitrite sources, amine reagents, pH, temperature, process sequence, purge and analytical evidence.

05India status for this compound

These results apply only to this exact compound name and CAS number. Confirm the current official instruments before making a regulatory decision.

NDPS / RCSNO EXACT MATCH FOUNDNo CAS number is available for an exact comparison.
SCOMETNO EXACT REVIEWED CAS MATCHNo CAS number is available for an exact comparison.
Review date2026-08-01Recheck the current official instruments for the material, concentration, activity and date in question.

06Names and relationships

Associated parent compound

No parent compound is listed.

Other names

No synonyms are listed.

Related records from the same parent family

No related records are linked by parent name.

07Documented history

Dated discovery, occurrence, use and issue claims are published only when a suitable primary or government source is available.

No dated history available

No verified discovery, first report, occurrence, use or issue event is currently available for this identity.

08Sources