Please follow the prompt as much as you can

Ertugliflozin is a medication for the treatment of type $2$ diabetes.

$5\mathrm{.}1$ Look at the structure and identify one of the following groups hemiacetal$/$acetal$/$hemiketal$/$ketal$.$ Circle and label it$.$

$5\mathrm{.}2$ Based on your identification above, predict the stability of Ertugliflozin under aqueous acidic and basic conditions. Complete the sentence: Ertugliflozin is stable under aqueous acidic$/$basic conditions and unstable under aqueous acidic$/$basic conditions.

$5\mathrm{.}3$ Support your predication by providing arrow$-$pushing mechanism for the hydrolysis reaction under the conditions you chose above. Use HA or B as needed.

$5\mathrm{.}4$ Draw the structure of the hydrolysis reaction product$($s$).$