<informationTable xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.sec.gov/edgar/document/thirteenf/informationtable">
  <infoTable>
    <nameOfIssuer>eFFECTOR Therapeutics Inc</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>28202V108</cusip>
    <value>3577605</value>
    <shrsOrPrnAmt>
      <sshPrnamt>4309329</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>4309329</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>NGM Biopharmaceuticals Inc</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>62921N105</cusip>
    <value>46974144</value>
    <shrsOrPrnAmt>
      <sshPrnamt>18136735</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>18136735</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>ORIC Pharmaceuticals Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>68622P109</cusip>
    <value>27689085</value>
    <shrsOrPrnAmt>
      <sshPrnamt>3568181</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>3568181</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>RAPT Therapeutics Inc</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>75382E109</cusip>
    <value>50127613</value>
    <shrsOrPrnAmt>
      <sshPrnamt>2680621</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>2680621</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>Revolution Medicines Inc</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>76155X100</cusip>
    <value>68940635</value>
    <shrsOrPrnAmt>
      <sshPrnamt>2577220</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>2577220</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>Surrozen, Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>86889P109</cusip>
    <value>5178137</value>
    <shrsOrPrnAmt>
      <sshPrnamt>9414795</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>9414795</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>Tenaya Therapeutics, Inc.</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>87990A106</cusip>
    <value>55179702</value>
    <shrsOrPrnAmt>
      <sshPrnamt>9400290</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>9400290</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
</informationTable>
