Common use of SIGNATURE PAGE FOLLOWS Clause in Contracts

SIGNATURE PAGE FOLLOWS. This Amendment to Agreement and Plan of Merger (this “Amendment”), dated as of January 27, 2021, is by and among Big Rock Partners Acquisition Corp., a Delaware corporation (“BRPA”), NeuroRx, Inc., a Delaware corporation (the “Company”), and Big Rock Merger Corp., a Delaware corporation and wholly owned Subsidiary of BRPA (“Merger Sub”). Each of BRPA, Merger Sub, and the Company, are referred to herein, individually, as a “Party” and, collectively, as the “Parties”.