# What do the dots mean in HN.CO.CH3 connected to the second carbon of N- Acetylglucosamine? And what do the N and acetyl indicate?

What do the dots mean in HN.CO.CH3 connected to the second carbon of N- Acetylglucosamine? And what do the N and acetyl indicate?

• What is glucosamine? What is an acetyl? The acetyl is connected to the amine at the nitrogen atom, hence N-acetyl. These "dots" (they look more like blobs to me) are just a simple covalent bond. Why they look like blobs I have no idea. – Karl Jan 5 at 12:46
• These don't look like dots to me, more like en-dashes used for denoting chemical bonds (e.g. $\ce{HN-CO-CH3}$). Probably they were chosen short by the typography in order to fit an entire structure on the page. N- indicate the substituent on the nitrogen, and the task of finding what is acetyl is I leave to you:) – andselisk Jan 5 at 12:47
• They look more like dashs to me, a dash is a common symbol for a single bond – Nuclear Chemist Jan 5 at 13:14