Multi-substituent psilocybin derivatives and methods of using

A chemical compound or a salt thereof having a formula (I):

• wherein, at least two of R2, R4, R5, R6, or R7 are substituents independently selected from at least one of each of (i) a halogen atom, and (ii) an aldehyde or a ketone group, and wherein each non-substituted R2, R5, R6, or R7 is a hydrogen atom and when R4 is not substituted with any of the foregoing substituents, R4 is a hydrogen atom, an O-alkyl group, an O-acyl group, or a phosphate group, and wherein R3a and R3b are each independently a hydrogen atom, an alkyl group, a cycloalkyl group, an acyl group, or an aryl group, and R3c is a hydrogen atom or a carboxyl group.