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\begin{tabular}{@{}l l}
\raise2.7em \hbox{b.} & {\tetrahedral{0==CHCH$_{2}$CH$_2$;1==CH$_{3}$;
3==CH$_{2}$;4==%
{\tetrahedral{0==CHCH$_{2}$CH$_{2}$;2==(yl);1==%
{\tetrahedral{0==CH$_{2}$;3==(yl);1==%
{\tetrahedral{0==CH;1==CH$_{3}$;2==H$_{3}$C;3==(yl)}}}};
4==%
{\tetrahedral{0==CHCH$_{3}$;1==CH$_{3}$;2==(yl)}
}}<100,100,100,-010>}}<100,100,100,-010>}\\[1.5em]
\end{tabular}