Pode criar o símbolo com esta info:
http://finance.lycos.com/home/misc/symbol_search.asp?options=f
O site tem mais info mas esta é a principal:
Ticker symbols for commodity futures are formed by a combination of the underlying symbol followed by the month code followed by one digit for the year. Here are some examples of commodity futures ticker symbols:
BPU4 = British Pound, September 1994
EDZ5 = Eurodollar Time Deposit, December 1995
DMY = German Mark, Cash
CF5 = Corn, January 1995
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Month Codes
F January
G February
H March
J April
K May
M June
N July
Q August
U September
V October
X November
Z December
Y Cash or Spot price (no year, usually)