<informationTable xmlns="http://www.sec.gov/edgar/document/thirteenf/informationtable">		<infoTable>
			<nameOfIssuer>ACLARIS THERAPEUTICS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>00461U105</cusip>
			<value>7560</value>
			<shrsOrPrnAmt>
				<sshPrnamt>4000000</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<votingAuthority>
				<Sole>4000000</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CHENIERE ENERGY INC</nameOfIssuer>
			<titleOfClass>COM NEW</titleOfClass>
			<cusip>16411R208</cusip>
			<value>64124</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1050000</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<votingAuthority>
				<Sole>1050000</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CYCLERION THERAPEUTICS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>23255M105</cusip>
			<value>4047</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1487874</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<votingAuthority>
				<Sole>1487874</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>EVOLUS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>30052C107</cusip>
			<value>1460</value>
			<shrsOrPrnAmt>
				<sshPrnamt>120000</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<votingAuthority>
				<Sole>120000</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>FOX CORP</nameOfIssuer>
			<titleOfClass>CL A COM</titleOfClass>
			<cusip>35137L105</cusip>
			<value>87831</value>
			<shrsOrPrnAmt>
				<sshPrnamt>2369331</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<votingAuthority>
				<Sole>2369331</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>GTT COMMUNICATIONS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>362393100</cusip>
			<value>13048</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1149596</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<votingAuthority>
				<Sole>1149596</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>IRONWOOD PHARMACEUTICALS INC</nameOfIssuer>
			<titleOfClass>COM CL A</titleOfClass>
			<cusip>46333X108</cusip>
			<value>85710</value>
			<shrsOrPrnAmt>
				<sshPrnamt>6439541</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<votingAuthority>
				<Sole>6439541</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>LIBERTY GLOBAL PLC</nameOfIssuer>
			<titleOfClass>SHS CL C</titleOfClass>
			<cusip>G5480U120</cusip>
			<value>87181</value>
			<shrsOrPrnAmt>
				<sshPrnamt>4000040</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<votingAuthority>
				<Sole>4000040</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PG&amp;E CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>69331C108</cusip>
			<value>38635</value>
			<shrsOrPrnAmt>
				<sshPrnamt>3554299</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<votingAuthority>
				<Sole>3554299</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PIONEER NAT RES CO</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>723787107</cusip>
			<value>39886</value>
			<shrsOrPrnAmt>
				<sshPrnamt>263500</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<votingAuthority>
				<Sole>263500</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>XPO LOGISTICS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>983793100</cusip>
			<value>55790</value>
			<shrsOrPrnAmt>
				<sshPrnamt>700000</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<votingAuthority>
				<Sole>700000</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
</informationTable>
