A(--) vs. A(2-)

In the molecule below, Marvin shows the double negative charge as two minus charges, --. But the gap between them is so small that it's hard to tell that they are two minuses, not just one. Either increase the gap between the two - signs, or just use 2-. Interestingly, if there is no radical state indicated on the atom, Marvin does use the 2- depiction.

Code:

<?xml version="1.0" ?> <cml> <MDocument>   <MChemicalStruct>     <molecule molID="m1">       <atomArray           atomID="a1 a2 a3"           elementType="C C C"           formalCharge="-2 0 0"           radical="divalent 0 0"           x2="-4.400000095367432 -5.940000095367432 -4.798581424825313"           y2="1.375 1.3750000000000002 2.8625257724851654"           />       <bondArray>         <bond atomRefs2="a1 a2" order="1" />         <bond atomRefs2="a1 a3" order="1" />       </bondArray>     </molecule>   </MChemicalStruct> </MDocument> </cml>

Dear Bob,





You are right, it's hard to see the two minuses of the double negative charge. The IUPAC recommendation is 2- (http://www.iupac.org/reports/provisional/abstract04/RB-prs310804/Chap3-3.04.pdf),


so we will use the "2-" depiction instead of "--".





Best regards,


Erika

Dear Bob,





The charge drawing improvement is going to be ready in Marvin 5.2.





Best regards,


Erika.