chemical relationship is protonated form of (E)-cinnamoyl-CoA (CHEBI:10956) is a protonated form of (E)-cinnamoyl-CoA(4-) (CHEBI:57252), which involves adding four protons. obo:chebi#is_conjugate_acid_of A is a protonated form of B if and only if A is chemical entity that is a Brønsted–Lowry Acid (i.e., can give up a proton) and by removing some nonzero number of protons transforms it into B. This is a transitive relationship and follows this design pattern: https://oborel.github.io/obo-relations/direct-and-indirect-relations.