phosphatidylglycerol biosynthetic process cardiolipin metabolic process cardiolipin biosynthetic process https://github.com/geneontology/go-ontology/issues/31634 biological_process diphosphatidylglycerol biosynthetic process MetaCyc:PWY0-1545 GO:0032049 diphosphatidylglycerol biosynthesis MetaCyc:PWY-5668 MetaCyc:PWY-5269 Reactome:R-HSA-1483076 The chemical reactions and pathways resulting in the formation of cardiolipin, 1,3-bis(3-phosphatidyl)glycerol.