<qa>  What is the first study in human studies of NYX-2925?This is a first in human study of NYX-2925. This is a randomized, double-blind, sponsor-open, placebo-controlled, single and multiple ascending dose, parallel safety, tolerability, and PK study of oral NYX-2925 in healthy volunteers. The single ascending dose phase will comprise up to five dose groups. There will be up to 3 dose groups in the multiple ascending dose phase. One open-label dose group will be repeated in the multiple ascending dose phase to collect cerebrospinal fluid CSF samples, in order to explore central nervous system penetration. One elderly cohort single dose will be completed after all single and multiple dose escalation groups have completed. One open-label dose group will be repeated in the single ascending dose phase to collect CSF samples, in order to establish a more complete cerebral spinal fluid pharmacokinetic profile. 