[Moazi]

I cannot seem to find the name of the R group attached to the Methionine, it's driving me crazy. Please help.

[Borek]

Not sure what you mean, can you elaborate on the context?

R is typically used when referring to a group of compounds sharing some common part, methionine is a specific compound with well defined composition and structure.

[sjb]

Do you mean the R in the generic formula for α-amino acids - which for e.g. alanine is methyl?

[Moazi]

yes, for example it's Hydrogen in Glycine, Indole in Tryptophan and methyl in Alanine.
what about Methionine

[Moazi]

Not sure what you mean, can you elaborate on the context?

R is typically used when referring to a group of compounds sharing some common part, methionine is a specific compound with well defined composition and structure.

I mean what's the name of the Group attached to the the amino acid in methionine

[wildfyr]

I guess you would call it ethyl methyl sulfide or thioether

[mjc123]

Or 2-(methylthio)ethyl.