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This worked; thanks a lot. I didn't put the line right after \documentclass as advised in the post linked above (because I don't know how to access that part in LyX, just have a look at it using View->View Source); but at the beginning of the preamble with the title, authors and so on and it worked ...

Hello everyone

I'm new to LaTeX and decided to use LyX to hopefully ease the transition from word-type programs. I had a look at different document classes and found a really nice one: article (ACS) using the achemso LaTeX package to write articles for journals of the American Chemical Society. The ...