mpo apiThe MPO API. A workflow in MPO is represented as a directed acyclic graph with data objects (ellipses) and activities (rectangles) as the nodes. The head node (diamond) ofTo predict the CNS MPO Score with cxcalc, use the mpo function: cxcalc -N ih mpo aspirine 5.75 Chemical Terms. To predict the MPO Score with Chemical Terms, use the mpo() function: