Build a 13-atom linear chain numbered 1 to 13. Atoms 1 to 5, 7, 9 to 13 are carbons; 6 is nitrogen; 8 is oxygen. All bonds are single except the bond between 6 and 7, which is a N=C double bond (no E/Z specified). 

Substituents on this long chain:
- C1, C2, C5, C9, and C12 each carry two methyl groups (gem-dimethyl at each of those positions).
- C7 bears a sulfanyl group (-SH) via a single bond.