... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > acid anhydride > acyclic acid anhydride > acyclic phosphorus acid anhydride > diphosphoric acid

... > chemical entity > molecular entity > polyatomic entity > heteroatomic molecular entity > hydroxides > oxoacid > pnictogen oxoacid > phosphorus oxoacid > diphosphoric acid

... > chemical entity > molecular entity > main group molecular entity > s-block molecular entity > hydrogen molecular entity > hydroxides > oxoacid > pnictogen oxoacid > phosphorus oxoacid > diphosphoric acid

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > chalcogen molecular entity > oxygen molecular entity > hydroxides > oxoacid > pnictogen oxoacid > phosphorus oxoacid > diphosphoric acid

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > pnictogen molecular entity > pnictogen oxoacid > phosphorus oxoacid > diphosphoric acid

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > pnictogen molecular entity > phosphorus molecular entity > phosphorus oxoacids and derivatives > phosphorus oxoacid > diphosphoric acid