In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.
Q: Sentence 1:The technique only works well for higher charge state peptide or polymer ions ( z > 2 ) . Sentence 2:However , relative to collision - induced dissociation ( CID ) , ETD is advantageous for the fragmentation of longer peptides or even entire proteins .
A: 
however