tert-Butyl (2R,4aR,5aR,11aS,12R,12aR)-8-[bis-(tert-but-oxycarbon-yl)amino]-12-hydroxy-2-meth-oxy-2,10-dioxo-4,4a,5a,6,9,10,11,11a,12,12a-deca-hydro-2H-1,3,5-trioxa-6,7,9,11-tetra-aza-2λ(5)-phosphatetra-cene-6-carboxyl-ate methanol monosolvate monohydrate.

The title compound, C(26)H(40)N(5)O(13)P·CH(3)OH·H(2)O, crystallizes with one water and one methanol mol-ecule providing important crystal-binding inter-actions. The compound has the unusual feature of having two but-oxy-carbonyl groups bound to one N atom. The conventional attractive hydrogen bonds involving hy-droxy, amine and water donors include bifurcations at both donors and acceptors with novel R(1) (2)(6) and R(2) (1)(6) motifs. These are supplemented by C-H⋯O inter-actions between adjacent mol-ecules forming chain and R(2) (2)(10) ring motifs.