source of electron-flow arrow same as sink

A student submitted a response that contained this substructure:

<?xml version="1.0" encoding="MacRoman"?>

<cml xmlns="http://www.chemaxon.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.chemaxon.com/marvin/schema/mrvSchema_14_8_4.xsd" version="ChemAxon file format v14.8.4, generated by v14.9.15.0">

<MDocument>

  <MChemicalStruct>

    <molecule molID="m1">

      <atomArray atomID="a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11" elementType="C C C C C O Br C C C R" formalCharge="0 0 0 0 0 -1 0 0 0 0 0" sgroupRef="0 0 0 0 0 0 0 0 0 0 sg1" x2="18.185440354142237 18.16500420964244 20.02570119002458 21.730644854853615 23.48435161744974 25.375607873608672 25.08369287761191 22.734764190961076 21.75686049374216 19.641265440039543 20.05442316111584" y2="-19.366658113616403 -21.34498282319398 -22.173856634348844 -20.952912221839135 -22.40778240150039 -20.370805180942533 -18.705197183867796 -18.121355945160794 -19.167488267113608 -18.0077326756293 -16.27852500996707"/>

      <bondArray>

        <bond id="b1" atomRefs2="a1 a2" order="1"/>

        <bond id="b2" atomRefs2="a2 a3" order="2"/>

        <bond id="b3" atomRefs2="a3 a4" order="1"/>

        <bond id="b4" atomRefs2="a4 a5" order="1"/>

        <bond id="b5" atomRefs2="a5 a6" order="1"/>

        <bond id="b6" atomRefs2="a7 a8" order="1"/>

        <bond id="b7" atomRefs2="a8 a9" order="1"/>

        <bond id="b8" atomRefs2="a9 a10" order="1"/>

        <bond id="b9" atomRefs2="a10 a11" order="1"/>

        <bond id="b10" atomRefs2="a4 a9" order="1"/>

        <bond id="b11" atomRefs2="a10 a1" order="1"/>

      </bondArray>

      <molecule id="sg1" role="SuperatomSgroup" title="CO2Me" leftName="MeO2C" molID="m2">

        <atomArray atomID="a12 a13 a14 a15" elementType="C O C O" attachmentPoint="1 0 0 0" sgroupAttachmentPoint="1 0 0 0" x2="20.350740456963596 19.952159127505713 18.464633355020545 21.838266229448756" y2="-17.119314527328463 -15.6317887548433 -15.233207425385423 -17.517895856786346"/>

        <bondArray>

          <bond id="b12" atomRefs2="a13 a12" order="1"/>

          <bond id="b13" atomRefs2="a12 a15" order="2"/>

          <bond id="b14" atomRefs2="a14 a13" order="1"/>

        </bondArray>

        <AttachmentPointArray>

          <attachmentPoint atom="a12" order="1" bond="b9"/>

        </AttachmentPointArray>

      </molecule>

    </molecule>

  </MChemicalStruct>

  <MEFlow id="o2" arcAngle="274.76749242" headSkip="0.25" headLength="0.5" headWidth="0.4" tailSkip="0.25" baseElectronContainerIndex="0" baseElectronIndexInContainer="0">

    <MAtomSetPoint atomRefs="m1.a7 m1.a8"/>

    <MAtomSetPoint atomRefs="m1.a8 m1.a7" weights="0.25 0.75"/>

  </MEFlow>

</MDocument>

</cml>

Note that the electron-flow arrow originates at the same bond to which it points. It should not be possible to make an atom or a bond both an electron-flow arrow's source and its sink.

Dear Bob,

Thank you for reporting this issue, I filed a report to our issue tracking system, and we will notify you if it is done.

 

Regards,

Tamas Fazekas-Vígh