Psychotropic agents and uses thereof

A method of treating one or more conditions responsive to modulation of one or more serotonin receptors in a subject comprising administering to the subject a therapeutically effective amount of a compound having a structure of Formula IA:

• including pharmaceutically acceptable salts and stereoisomers thereof, wherein:
• X and Z are the same or different and independently selected from the group consisting of hydrogen, and alkyl;
• with the proviso that at least one of X and Z is not hydrogen.

A method of treating one or more disorders associated with a mental illness of a subject, the method comprising administering to the subject a therapeutically effective amount of the substantially enantiomerically pure R isomer of a compound having a structure of Formula IA:

• including pharmaceutically acceptable salts and stereoisomers thereof, wherein:
• X and Z are the same or different and independently selected from the group consisting of hydrogen, and alkyl;
• with the proviso that at least one of X and Z is not hydrogen, wherein the mental illness is selected from the group consisting of schizophrenia, symptoms of schizophrenia, schizoaffective disorder bipolar disorder, depression, obsessive-compulsive disorder, Parkinson's psychosis, Alzheimer's psychosis, oppositional defiant disorder, aggression, suicidality, hostility, personality disorders, autism, chronic fatigue syndrome, predominantly negative symptoms of schizophrenia, Charles Bonnet Syndrome, and Tourette's disorder.