Some clarification around sql verbage within R, specifically with dbListFields

Question

I'm using R to connect to an Oracle Database. I'm able to do so with this code:

library(rJava)   
library(RJDBC)   

jdbcDriver <- JDBC(driverClass="oracle.jdbc.driver.OracleDriver", classPath="jar files/ojdbc8.jar")  
jdbcConnection <- dbConnect(jdbcDriver, "jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=blablablablabla.com)(PORT=1234))(CONNECT_DATA=(SERVICE_NAME=pdblhs)))", "myusername", "mypassword")  
DataFrame <- dbGetQuery(jdbcConnection, "select protocol_id, disease_site_code, disease_site
From abc_place_prod.Rv_sip_PCL_disease_site
order by protocol_id")  

# Close connection
dbDisconnect(jdbcConnection) 

This snippet of code works. It downloads the data I want into a neat data frame and works as planned.

But I'm trying to learn how to navigate with R/SQL more and I wanted to use dbListFields to explore all the possible column names in that table I'm pulling from. Per the documentation here, you could type something like this:

dbListFields(con, "mtcars")

and it would work. So I tried:

dbListFields(jdbcConnection, "abc_place_prod.Rv_sip_PCL_disease_site")

and it returned this error:

Error in dbSendQuery(conn, paste("SELECT * FROM ", dbQuoteIdentifier(conn,  : 
  Unable to retrieve JDBC result set
  JDBC ERROR: ORA-00933: SQL command not properly ended

It seems like someone else experienced something similar here and I'm not sure it ever got answered. I've tried it with a semicolon at the end (that "ended" something else properly for me, and its mentioned in the comments of this question) and no luck.