Abstract: The present disclosure provides a compound comprising a modified tetracycline derivative, covalently coupled through a linker to a low-hydrophobicity bioactive molecule useful for treating neurodegenerative diseases, wherein the modified tetracycline derivative is optionally defined by the following formula:

Abstract: The present disclosure provides a compound comprising a modified tetracycline derivative, covalently coupled through a linker defined by the generic formula XZX to a low-hydrophobicity bioactive molecule useful for treating neurodegenerative diseases, particularly a compound wherein the modified tetracycline derivative is a chemically modified doxycycline derivative and the low-hydrophobicity bioactive molecule useful for treating neurodegenerative diseases is dopamine. The disclosure also provides a process for preparing such compound, as well as methods for treating a neurodegenerative disease comprising administering said compound.