Additions and Corrections - Stereochemistry of Nucleic Acids and Their Constituents. XI. The Molecular Structure and Conformation of α-Pseudouridine Monohydrate, an Unusual Nucleoside with a "Glycoside" Carbon-Carbon Bond. Stereochemistry of Nucleic Acids and Their Constituents. XII. The Crystal and Molecular Structure of α-D-2'-Amino-2'-deoxyadenosine Monohydrate