Fosinopril Related Compound C;(4S)-4-Cyclohexyl-1-[2-[(RS)-[(1SR)-2-methyl-1-(1-oxopropoxy)propoxy](4-phenylbutyl)phosphinyl]acetyl]-L-proline sodium salt;(4S)-4-cyclohexyl-1-[(RS)-1-hydroxy-2-Methylpropoxy](4-phenylbutyl)phosphinyl]-acetyl-L-proline propionate (ester), sodiuM salt