Description  Claims  Cited references 

US61903893PCT   [0001] 
US4349552A   [0016] 

Protective Groups in Organic Chemistry   [0022] 
Protective Groups in Organic Synthesis   [0022] 
Protecting Groups   [0022] 
Handbook of Chemistry and Physics   [0023] 
Organic Chemistry   [0023] 
March's Advanced Organic Chemistry   [0023] 
Protective Groups in Organic Synthesis   [0024] 
Protective Groups in Organic Synthesis   [0024]