\usemodule[chemic, units, pictex]
\mainlanguage[de]
\language[de]
\enableregime[il1]
\setupencoding[default=texnansi]
\setuppapersize[A4]

\starttext



\startchemical 
\chemical[ONE,SB1,SB4,SB2,SB7,Z01247][C,H,H,H,H] 
\stopchemical

\stoptext