4,8-Ethenobenzo[1,2-c:4,5-c']dipyrrole-1,3,5,7(2H,6H)-tetrone, 3a,4,4a,7a,8,8a-hexahydro-2,6-bis(hydroxymethyl)-, (3a.alpha.,4.beta.,4a.alpha.,7a.alpha.,8.beta.,8a.alpha.)- NSC366370