https://en.wikipedia.org/wiki/Ritonavir?useskin=vector#Polymorphism_and_temporary_market_withdrawal https://en.wikipedia.org/wiki/Ritonavir?useskin=vector#Polym

https://en.wikipedia.org/wiki/Ritonavir?useskin=vector#Polymorphism_and_temporary_market_withdrawal https://en.wikipedia.org/wiki/Ritonavir?useskin=vector#Polym... When in solid form even the smallest amount can convert the whole batch to the much less effective version.