Table schema:
CREATE TABLE table_101336_1 (notation VARCHAR, crystal_structure VARCHAR, formula VARCHAR)

Question: What is the notion when the crystal structure is tetragonal and the formula is bi 2 sr 2 cacu 2 o 8
SQL: SELECT notation FROM table_101336_1 WHERE crystal_structure = "Tetragonal" AND formula = "Bi 2 Sr 2 CaCu 2 O 8"