The article about ChemDraw shows that the structure-drawing program is clearly useful (C&EN, Aug. 18, page 26). However, in my experience it has one flaw. Students are consistently asked to submit their proposed structures with the samples before we do a mass spectrum. How is it possible that ChemDraw allows a unique property of the molecule (its exact mass) to be listed as a variable?
Explaining this to students is fine, but to ChemDraw it’s different. Change the number of decimal places to four, never touch it again, and all will be fine.