l-ascorbic acid-1- ( 14 ) c and its oxidation product , dehydro-l-ascorbic acid , produced labeled oxalic acid in oxalate-accumulating plants such as spinach seedlings ( spinacia oleracea ) and the detached leaves of woodsorrel ( oxalis stricta and o. oregana ) , shamrock ( oxalis adenopylla ) , and begonia ( begonia evansiana ) .
C0069715
oxalic acid
C0029988
oxalate