Abstract: The present invention provides a conjugate of formula (I) and its use in methods of treatment, and also methods for delivering an active agent into a cell. The methods may be used to deliver an active agent into a nematode, flatworm, parasite or bacterium. The conjugate of formula (I) is: (formula (I)), wherein -D- is C1-4 alkylene or C2-4 alkenylene, preferably C2-4 alkenylene, where the alkylene or alkenylene is optionally substituted with alkyl or halo; A- is an active agent for delivery; and —RA, —RB, —RT1, —RT2, —R1, —R2, —R3, —X— and -L- are as defined herein.