name mhchem category Package shortdesc Typeset chemical formulae/equations and Risk and Safety phrases longdesc Currently, the mhchem bundle consists of two packages: mhchem and longdesc rsphrase. The mhchem package provides two commands: one for longdesc typesetting chemical molecular formulae and one for typesetting longdesc chemical equations with these formulae. The rsphrase package longdesc contains the text of all official Risk and Safety (R and S) longdesc Phrases that are used to label chemicals. At the time being, these longdesc phrases are available in Danish, English, French, German (current longdesc spelling), and Spanish. [description copied from TeX Catalogue]