THF -> _5_10_CH2THF
_5mTHF -> THF
_5_10_CH2THF -> _5mTHF
_10fTHF -> THF
THF -> _10fTHF
_10fTHF -> THF
_10fTHF -> THF
_5_10_CH2THF -> DHF
DHF -> THF
_5_10_CHTHF -> _10fTHF
THF -> _5_10_CH2THF
_5_10_CH2THF -> _5_10_CHTHF