Displaying 1 results of Letrozole Stable Isotopes Letrozole stable isotopes are a set of isotopes that have the same number of protons and electrons as the naturally occurring Letrozole molecule, but differ in the number of neutrons. These isotopes are useful in research and drug development as they allow for the tracking and quantification of Letrozole in biological systems. They are also important in metabolic studies and pharmacokinetic research.