RSRGD2000 Pennell Coast LC2000 - EPSG:5481

WKT

PROJCS["RSRGD2000_PCLC2000", 
	GEOGCS["GCS_RSRGD2000", 
		DATUM["D_Ross_Sea_Region_Geodetic_Datum_2000", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Lambert_Conformal_Conic"], 
	PARAMETER["False_Easting", 3000000.0], 
	PARAMETER["False_Northing", 1000000.0], 
	PARAMETER["Central_Meridian", 166.0], 
	PARAMETER["Standard_Parallel_1", -70.66666666666667], 
	PARAMETER["Standard_Parallel_2", -72.33333333333333], 
	PARAMETER["Latitude_Of_Origin", -71.5], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["RSRGD2000_PCLC2000", 
	BASEGEOGCRS["GCS_RSRGD2000", 
		DATUM["D_Ross_Sea_Region_Geodetic_Datum_2000", 
			ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Lambert_Conformal_Conic", 
		METHOD["Lambert_Conformal_Conic"], 
		PARAMETER["False_Easting", 3000000.0], 
		PARAMETER["False_Northing", 1000000.0], 
		PARAMETER["Central_Meridian", 166.0], 
		PARAMETER["Standard_Parallel_1", -70.66666666666667], 
		PARAMETER["Standard_Parallel_2", -72.33333333333333], 
		PARAMETER["Latitude_Of_Origin", -71.5]], 
	CS[Cartesian, 2], 
	AXIS["Northing (Y)", north, 
		ORDER[1]], 
	AXIS["Easting (X)", east, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "5481"]]

Data from @esri/proj-codes

{
  "wkid": 5481,
  "latestWkid": 5481,
  "gcsWkid": 4764,
  "macro": "PE_PCS_RSRGD2000_PCLC2000",
  "name": "RSRGD2000_PCLC2000",
  "wkt": "PROJCS[\"RSRGD2000_PCLC2000\",GEOGCS[\"GCS_RSRGD2000\",DATUM[\"D_Ross_Sea_Region_Geodetic_Datum_2000\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Lambert_Conformal_Conic\"],PARAMETER[\"False_Easting\",3000000.0],PARAMETER[\"False_Northing\",1000000.0],PARAMETER[\"Central_Meridian\",166.0],PARAMETER[\"Standard_Parallel_1\",-70.66666666666667],PARAMETER[\"Standard_Parallel_2\",-72.33333333333333],PARAMETER[\"Latitude_Of_Origin\",-71.5],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"RSRGD2000_PCLC2000\",BASEGEOGCRS[\"GCS_RSRGD2000\",DATUM[\"D_Ross_Sea_Region_Geodetic_Datum_2000\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Lambert_Conformal_Conic\",METHOD[\"Lambert_Conformal_Conic\"],PARAMETER[\"False_Easting\",3000000.0],PARAMETER[\"False_Northing\",1000000.0],PARAMETER[\"Central_Meridian\",166.0],PARAMETER[\"Standard_Parallel_1\",-70.66666666666667],PARAMETER[\"Standard_Parallel_2\",-72.33333333333333],PARAMETER[\"Latitude_Of_Origin\",-71.5]],CS[Cartesian,2],AXIS[\"Northing (Y)\",north,ORDER[1]],AXIS[\"Easting (X)\",east,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"5481\"]]",
  "description": "RSRGD2000 Pennell Coast LC2000",
  "authority": "EPSG",
  "version": "7.6.9(10.1.0)",
  "deprecated": "no",
  "areaname": "Antarctica - Pennell Coast region",
  "extent": {
    "slat": -73,
    "nlat": -69.5,
    "llon": 160,
    "rlon": 172
  }
}