Provided are compounds of formula (III), and the use of compounds of formula (III) in methods of treatment, such as methods of treating a microbial infection. The compounds of formula (III) is: where -R15 is an amino-containing group: and -R1, -R2, -R3, -R4, -R8, -RA, Q, -R16, -R17 are as described in further detail in the description.
