Consider the following two molecules. The left$($bottom$)$ structure is pyoverdine, a siderophore $($iron$-$

binding molecule$),$ which is used by microbes to obtain iron $($or other metal ion$)$ from the environment.

The right $($top$)$ structure is hamycin, an antifungal compound produced by certain filamentous soil

bacteria, such as streptomyces.

A$)$ In the above molecules, find AT LEAST $6$ different functional groups $-$ circle and identify $($you

should identify as many as you can$).(3$ pts$)$

B$)$ A different siderophore can be isolated from Yersinia pestis $($the plague bacteria$).$ How many

titrable protons $($protons which are invoved in polar covalent bonds$)$ are present in this

molecule $($if any$)?$ If there are titratable protons, identify them in the molecule. $(2$ pts$)$