There is an answer to a question that I am hiding as a comment in the source below that very clearly and explicitly links to Sci-Hub in order to provide a PDF for a paid article.
Without bringing up anyone's personal opinions, what is Chemistry.SE's policy for linking against paywall-bypassing services? This applies primarily to questions and answers, not comments (because they are not meant to be permanent) or chat (because it is not meant to be an official record).