# Polymer structure in PPCHTEX - how to make big brackets?

I'm trying to draw polymer structure using PPCHTEX under ConTeXt packages, my current code is

\starttext
\startformula
\setupchemical[scale=small,width=fit]
\startchemical
\chemical[ONE,SB3,SB7,SB5,SB1,Z0,Z3,Z7,Z5][C,CH_3,CH_3,O]
\chemical[MOV1,ONE,Z0][O]
\chemical[MOV1,ONE,SB3,SB7,SB5,SB1,Z0,Z3,Z7,Z1][C,CH_3,CH_3,CH_3]
\chemical[MOV5,MOV5,MOV5,MOV5,ONE,SB3,SB7,SB5,SB1,Z0,Z3,Z7,Z5][C,CH_3,CH_3,CH_3]
\chemical[MOV1,3OFF1,3OFF1,OPENCOMPLEX]
\chemical[MOV1,MOV1,CLOSECOMPLEX]
\stopchemical
\stopformula
\stoptext


the problem is, that brackets produced by OPENCOMPLEX and CLOSECOMPLEX are too small, I have also tried using \Bigg\lbrace and \Bigg\rbrace instead, but it also produces too small brackets

Is there any way, how to make correct, big brackets?

• Can you post an image of the output that you get. My output is shown here. Do you want the brackets to be bigger than these? To change the brackets, you can change \definechemicalsymbol[opencomplex] [\mathematics{\Bigg[}] to something else. – Aditya Dec 5 '13 at 7:57
• @Aditya that's what I get, too. The brackets should include the CH_3 groups... also the vertical bonds are ending at H atoms (which is wrong). They should arrive at the C atoms. – cgnieder Dec 5 '13 at 9:57
• I would suggest posting on the context mailing list. There are no ConTeXt users using chemistry here. – Aditya Dec 5 '13 at 14:26