Octadecasodium hexakis(4-{[(1S,3R)-1-(1,1'-biphenyl]-4-ylmethyl)- 4-ethoxy-3- methyl-4-oxobutyl]amino}-4-oxobutanoate) hexakis(N- pentanoyl-N-{[2'-(1H- tetrazol-1-id-5-yl) [1,1'-biphenyl]-4- yl]methyl}-L-valinate)pentadecahydrate