On June 22, 2020, La Jolla Pharmaceutical Company announced that on each of May 6, 2020 and May 11, 2020, La Jolla Pharmaceutical sent Tetraphase Pharmaceuticals, Inc. a letter offering to purchase the Company at a premium to the purchase price the Company had accepted from another prospective purchaser. La Jolla Pharmaceutical stated that before it was able to fully engage with the Company on its offer, the Company entered into an acquisition agreement with another prospective purchaser at a purchase price higher than that offered by the La Jolla Pharmaceutical. La Jolla Pharmaceutical stated that it has sent the Company another bid letter on June 19, 2020, once more offering to acquire the Company at a premium to the then-current purchase price. La Jolla Pharmaceutical stated that it continues to offer and pursue a competing bid for the acquisition of the Company.