All parties to the transaction, Type of deal structure , Price , Payment structure, Non_compete ,Transition plan ,Closing date ,Contingencies (i.e. due diligence, financing, etc.) ,And identify other items to be negotiated.
When "LOI" is used, it actually refers to the Letter of Indemnity. This is standard usage of the term and has been for decades. The Letter of Intent (hereafter referred to as LOI) is often used in specific domestic trades, such as in real estate or corporate mergers, but it has no standard usage in International Trade itself.