Assertion: valerian's acid | /r/UsedFor | refer to any compound
Facets:
value: in the nineteenth century
type: TEMPORAL
Source sentences:
text: The confusion between valeric and isovaleric acid may be due to the fact that in the nineteenth century, "valeric acid" referred to any compound having the empirical formula C 4 H 9 CO 2 H, and there are 4 isomers that have that formula -- including both valeric acid (pentanoic acid) and isovaleric acid.