Identify the missing reactant in the following reaction: $(?) + H^+ \xrightarrow{H_2O} \text{Salicylic acid} + CH_3COCH_3$

(A) The given reaction represents the acid-catalyzed hydrolysis of cumene hydroperoxide.
Cumene hydroperoxide undergoes rearrangement in the presence of an acid to form phenol and acetone $(CH_3COCH_3)$.
However,the product shown in the image is salicylic acid ($2$-hydroxybenzoic acid) along with acetone.
This specific reaction is the industrial preparation of salicylic acid from a substituted cumene hydroperoxide derivative,specifically $o$-carboxycumene hydroperoxide.
The missing reactant is $o$-carboxycumene hydroperoxide.