Chapter 21 – Amine Chemistry: Part 4 of 4

Whole-channel inclusion: Chemistry Unleashed is an honest teaching channel (title sample + 3 transcripts read: All three samples have no transcript, but titles/descriptions match the channel's established pattern of structured chapter-by-chapter lectures consistent with the 'whole' title-sample verdict.); this title passed a strict title check (sonnet) after a labelling pass.