In 1978, scientists extracted a compound with antitumor and antivirus properties from marine animals in the Caribbean Sea. A sample of the compound didemnin-A of mass of 1.756 mg was analyzed and found to have the following composition: 1.086 mg C, 0.148 mg H, 0.159 mg N, and 0.363 mg O. The molar mass of didemnin-A was found to be 942 g/mol. What is the molecular formula of didemnin A