Aminosteroids are a group of drugs with a similar structure based on a steroid nucleus. Examples are the muscle relaxants rocuronium, vecuronium, pipecuronium, pancuronium, and rapicuronium.
The other major type of muscle relaxants are the Benzylisoquinolines. These include tubocurarine, atracurium, mivacurium, doxacurium, gantacurium and cisatracurium.
References
Aminosteroid Wikipedia(Text) CC BY-SA