Disclosed is a conjugate having the formula B-L-D, wherein B is a prostate specific membrane antigen (PSMA) binding or targeting ligand, L is a linker, and D is a drug, wherein the linker is covalently bound to the drug and the linker is covalently bound to the ligand, and where the linker comprises a chain of at least seven atoms providing that the ligand is not an antibody or antigen-binding fragment of an antibody.