Organo-arsenoxide compounds and use thereof

A method of treating pancreatic cancer in a vertebrate, the method comprising administering to the vertebrate a therapeutically effective amount of a compound of general formula (I):

• or a salt, enantiomer, or racemate thereof, wherein
• the As(OH)2 group is para- to the N-atom on the phenyl ring;
• R1 is selected from hydrogen and C1-3 alkyl;
• R2 and R3 are the same or different and are independently selected from hydrogen and optionally substituted C1-3 alkyl;
• R4 and R5 are the same or different and are independently selected from hydrogen and optionally substituted C1-3 alkyl;
• m is 1;
• n is 1;
• * indicates a chiral carbon atom;
• and
• wherein each optional substituent is independently C1-3 alkyl, C1-3 alkoxy, halo, hydroxyl, or hydroxy(C1-3)alkyl.