Date	Severity	Status	Feedback
Oct 22 2017 11:52AM	Normal	Acknowledged	This SMILES does not seem to carry the 13C labeling in it and is identical to "normal" benzene? I've regenerated the SMILES on this record, and it now properly reflects the isotopic labeling. - Susan
Aug 15 2014 4:51PM	Normal	Acknowledged	Underlying molfile does not indicate the 13C atoms - it's the same as a regular benzene. This appears to be a bug in the structure display and download. The InChI does specify that they are 13C atoms.