Lability

noun

1. The quality of being labile; liability to lapse or err. Coleridge. See quotation under labile.
2. Instability, as, in chem., the quality of being easily broken down to form simpler chemical compounds or even elements.
3. Liability to lapse, err, or apostatize.
4. The property of changing readily.
5. The property of being labile{3}; -- of chemical compounds.

   "the lability of some natural products makes them difficult to isolate and identify"