A "therapeutic agent" used as an anticonvulsant, antiepileptic, antiarrhythmic. Its physical appearance is as white crystals or a powder. It's combustable and carcinogenic, and can cause reproductive and systemic effects in the user.

Other scarry aspects of diphenylhydantoin: a neoplastigen, a teratogen, a mutagen.


Sources:
physchem.ox.ac.uk
ntp-server.niehs.nih.gov

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