The aminosteroid RM-133 is a key representative of a new family of anticancer agents.
Eleven RM-133-related compounds were synthesized and characterized.
The in vivo potency of RM-133 was improved by protecting its 3α-OH.
Ester and carbamate derivatives of RM-133 are stabilized against metabolic enzymes.
The dimethylcarbamate derivative 3 is a selective and more stable anticancer agent.