This macro typesets the saturated carbon sixring in its most
favorable conformation. The axial and equatorial bond lines
to the substituents are always drawn by this macro, even when
there is no substituent in a particular position. This is the
usual practice in drawing the chair form.
$
R1$$
R2$$
R3$$
R4$$
R5$$
R6$$
R7$$
R8$
The eight arguments represent the respective substituent formulas
R1–R8.