13678-67-6 2,2'-(Thiobis(methylene))bisfuran 2,2'-(Thiodimethylene) difuran 2,2-(Thiodimethylene)-difuran 2-Furfuryl monosulfide Bis(2-furfuryl) sulfide Difurfuryl sulfide EINECS 237-172-3 FEMA No. 3238 Furan, 2,2'-(thiobis(methylene))bis- Furan, 2,2'-(thiodimethylene)di- Furfuryl sulfide