 This trial is a Phase 1 study in adolescents with ADHD and genetic disruptions impacting genes in the metabotropic glutamate receptor mGluR network. The objectives of the study are to evaluate the safety, tolerability, and pharmacokinetics following single-dose, oral administration of NFC-1 and to evaluate safety and tolerability and to obtain evidence for the effect of NFC-1 on ADHD severity and global functioning during and following four weeks of continuous treatment. Exploratory analyses will be performed to assess effect size of specific mGluR-network genes on ADHD based on responsiveness of patients to NFC-1. This study will be conducted at a single clinical site, the Jefferson University Hospital PKU Philadelphia, PA. 