Chemical identity

Ofloxacin EP Impurity D / Ofloxacin 10-Fluoro Isomer / 9-Piperazino Ofloxacin

CAS 197291-75-1 · C18H20FN3O4

01Identity

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

Lazychem IDLC-23918
PubChem CID71751685
NameOfloxacin EP Impurity D / Ofloxacin 10-Fluoro Isomer / 9-Piperazino Ofloxacin
CAS RN197291-75-1
Molecular formulaC18H20FN3O4
Molecular weight361.37 g/mol
IUPAC name(RS)-10-Fluoro-2,3-dihydro-3-methyl-9-(4-methyl-1-piperazinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid
InChIKeyFHAKLRRIGREDDW-UHFFFAOYSA-N

02Structure identifiers

2D structurePubChem CID 71751685
Two-dimensional chemical structure of Ofloxacin EP Impurity D / Ofloxacin 10-Fluoro Isomer / 9-Piperazino Ofloxacin, CAS 197291-75-1
Two-dimensional structure for the PubChem identity linked to this record. Confirm the identifiers before analytical use.

The parsed structure contains 4 rings, includes aromatic atoms, includes aliphatic carbon, contains at least one halogen atom. These statements are calculated from the published structure string.

Defined stereocentres0
Unassigned stereocentres1
Ring count4
Secondary amines0
Tertiary amines2
N-methyl amine sites1
SMILESCC1COC2=C3N1C=C(C(=O)C3=CC(=C2F)N4CCN(CC4)C)C(=O)O
InChINot listed
Formula from structureC18H20FN3O4
Molecular weight from structure361.37 g/mol

03Stereochemistry

The published structure contains 0 defined and 1 unassigned tetrahedral stereocentre. The exact wedge and dash depiction is shown above.

Defined centres0Structure assigned
Unassigned centres1Structure unspecified
Assignment statusUnassignedExact published identity
Tetrahedral upper bound≤ 2Before symmetry reduction

Published same-connectivity configurations

2 records

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.

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 site1 candidate
Chemical structure of Ofloxacin EP Impurity D / Ofloxacin 10-Fluoro Isomer / 9-Piperazino Ofloxacin 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 Ofloxacin EP Impurity D / Ofloxacin 10-Fluoro Isomer / 9-Piperazino Ofloxacin, 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
C17H17FN4O5
Candidate SMILES
CC1COc2c(F)c(N3CCN(N=O)CC3)cc3c(=O)c(C(=O)O)cn1c23

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 FOUNDCAS 197291-75-1 has no exact match in the reviewed published schedule.
SCOMETNO EXACT REVIEWED CAS MATCHCAS 197291-75-1 has no exact match in the reviewed SCOMET list.
Review date2026-08-01Recheck the current official instruments for the material, concentration, activity and date in question.

06Names and relationships

Associated parent compound

Ofloxacin

View API and impurity family

Other names

  • Ofloxacin EP Impurity D
  • Ofloxacin 10-Fluoro Isomer
  • 9-Piperazino Ofloxacin
  • 197291-75-1
  • UNII-8L87OH5G1Z
  • 8L87OH5G1Z
  • Ofloxacin specified impurity D [EP]
  • (3RS)-10-Fluoro-3-methyl-9-(4-methylpiperazin-1-yl)-7-oxo-2,3-dihydro-7H-pyrido(1,2,3-de)-1,4-benzoxazine-6-carboxylic acid
  • 7H-Pyrido(1,2,3-de)-1,4-benzoxazine-6-carboxylic acid, 10-fluoro-2,3-dihydro-3-methyl-9-(4-methyl-1-piperazinyl)-7-oxo-
  • OFLOXACIN IMPURITY D [EP IMPURITY]
  • RefChem:199285
  • Ofloxacin specified impurity D

Related records from the same parent family

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