Assertion: cyclopropane's hydrogen atom | /r/HasProperty | substituted in para position
Facets:
value: possibly
type: OTHER
Source sentences:
text: R 1 and R 2 represent a hydrogen atom, a lower alkyl group or an aryl or lower alkylaryl group, which may possibly be substituted, preferably in para position, by a halogen atom, preferably a chlorine atom;