3-pyrazolidinone salts

A 1-phenyl-3-pyrazolidinone salt of the formula ##STR14## in which X.sup..crclbar. is an inorganic anion,

• L represents the atoms necessary to complete an unsubstituted pyrrolidine, piperidine or morpholine ring,
• R.sub.1 is phenyl which is unsubstituted or substituted by alkyl, alkoxy, chloro, hydroxyl or amino,
• R.sub.2 and R.sub.3 are each hydrogen or lower alkyl which is unsubstituted or substituted or hydroxyl, alkoxy, aryloxy or amino, and
• R.sub.4 and R.sub.5 are each hydrogen, lower alkyl which is unsubstituted or substituted by hydroxyl, alkoxy, aryloxy or amino, or phenyl which is unsubstituted or substituted by alkyl, alkoxy, chloro, hydroxyl or amino.