human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Particle name, Particle symbol, Antiparticle symbol, Quark content, Rest mass ( MeV / c 2 ), J P C, Mean lifetime ( s ), Commonly decays to (>5% of decays)
###Question: What is the antiparticle symbol with a rest mess (mev/c2) of .47 ± .33?
gpt
SELECT Antiparticle symbol FROM table WHERE Rest mass ( MeV / c 2 ) = .47 ± .33