(b) Explain what kind of reaction (depicted by ??? in the reaction scheme below) would have to happen next to cause " Cu(H2BTC)2(H2O) " to form the extended network MOF structure. When doing so, it is recommended that you take the incomplete structures shown below and modify them only at the carboxylate functions. In this case, the structure does not need to be drawn in full 3D; you need only draw in what ? and ?? are along with any missing ligands for the Cu center (noting that all the bridging carboxylates are accounted for). Given the complexity of MOF networks, you should define an appropriate abbreviation for any other Cu2 cores that are found within the ?? part of your figure