COc1ccc2[nH]cc(CCNC(C)=O)c2c1
Melatonin, an endogenous molecule that has low peak concentrations in high-risk COVID-19 patients but high peak concentrations in low-risk COVID-19 patients
Suggested by Martin Smiesko and Markus Lill who noted that Diamond hit x0104 was remarkably similar to melatonin (with -F instead of -OMe substituent on indole ring)